$$U_{927}(x, y) = \frac{i x + i}{\sqrt{4 x y + 4 y - 1}}$$

$$Tsqrt2(n, k) = \begin{cases}\frac {k \binom{n+j}{n} \binom{2n+2j}{n+j}} {\binom{2j}{j} {n+k}} &\text{if n+k even, where j =} \frac{n+k} {2},\\\frac {k \binom{n+j}{n} \binom{2n+2j}{n+j}} {\binom{2j}{j} {n+k}} &\text{if n+k odd, where j =} \frac{n+k+1} {2},\\\end{cases} $$$$T_{927}(n, m, k) = \frac{k \operatorname{Tsqrt_{2}}{\left(m,k + m \right)} {\binom{k + m}{n}}}{k + m}$$