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Pyramid 1421
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$$U_{1421}(x, y) = \frac{\left(\frac{x}{1 - y} + 1\right)^{2}}{\left(1 - y\right)^{2}}$$
Pyramid 1422
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$$U_{1422}(x, y) = \frac{\left(\frac{x}{1 - y} + 1\right)^{2}}{\left(1 - y\right)^{3}}$$
Pyramid 1423
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$$U_{1423}(x, y) = \frac{\left(\frac{x}{\left(1 - y\right)^{2}} + 1\right)^{2}}{1 - y}$$
Pyramid 1424
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$$U_{1424}(x, y) = \frac{\left(\frac{x}{\left(1 - y\right)^{2}} + 1\right)^{2}}{\left(1 - y\right)^{3}}$$
Pyramid 1425
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$$U_{1425}(x, y) = \frac{\left(\frac{x}{\left(1 - y\right)^{3}} + 1\right)^{2}}{1 - y}$$
Pyramid 1426
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$$U_{1426}(x, y) = \frac{\left(\frac{x}{\left(1 - y\right)^{3}} + 1\right)^{2}}{\left(1 - y\right)^{2}}$$
Pyramid 1427
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$$U_{1427}(x, y) = \frac{\left(\frac{x}{1 - y} + 1\right)^{3}}{\left(1 - y\right)^{2}}$$
Pyramid 1428
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$$U_{1428}(x, y) = \frac{\left(\frac{x}{1 - y} + 1\right)^{3}}{\left(1 - y\right)^{3}}$$
Pyramid 1429
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$$U_{1429}(x, y) = \frac{\left(\frac{x}{\left(1 - y\right)^{2}} + 1\right)^{3}}{1 - y}$$
Pyramid 1430
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$$U_{1430}(x, y) = \frac{\left(\frac{x}{\left(1 - y\right)^{2}} + 1\right)^{3}}{\left(1 - y\right)^{3}}$$
Pyramid 1431
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$$U_{1431}(x, y) = \frac{\left(\frac{x}{\left(1 - y\right)^{3}} + 1\right)^{3}}{1 - y}$$
Pyramid 1432
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$$U_{1432}(x, y) = \frac{\left(\frac{x}{\left(1 - y\right)^{3}} + 1\right)^{3}}{\left(1 - y\right)^{2}}$$
Pyramid 1433
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$$U_{1433}(x, y) = \frac{\left(y + 1\right)^{2}}{- x \left(y + 1\right)^{3} + 1}$$
Pyramid 1434
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$$U_{1434}(x, y) = \frac{\left(y + 1\right)^{3}}{- x \left(y + 1\right)^{3} + 1}$$
Pyramid 1435
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$$U_{1435}(x, y) = \frac{\left(y + 1\right)^{2}}{\left(- x \left(y + 1\right) + 1\right)^{2}}$$
Pyramid 1436
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$$U_{1436}(x, y) = \frac{\left(y + 1\right)^{3}}{\left(- x \left(y + 1\right) + 1\right)^{2}}$$
Pyramid 1437
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$$U_{1437}(x, y) = \frac{\left(y + 1\right)^{3}}{\left(- x \left(y + 1\right)^{2} + 1\right)^{2}}$$
Pyramid 1438
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$$U_{1438}(x, y) = \frac{y + 1}{\left(- x \left(y + 1\right)^{3} + 1\right)^{2}}$$
Pyramid 1439
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$$U_{1439}(x, y) = \frac{\left(y + 1\right)^{2}}{\left(- x \left(y + 1\right)^{3} + 1\right)^{2}}$$
Pyramid 1440
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$$U_{1440}(x, y) = \frac{y + 1}{\left(- x \left(y + 1\right)^{2} + 1\right)^{2}}$$
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