155682

Appears in sequences

• Number of perfect matchings in the graph C_5 X C_{2n}.at n=2A231485
• Number of perfect matchings in the graph C_8 X C_n.at n=2A253678
• Square array T(n,k), n >= 1, k >= 1, read by antidiagonals, where T(n,k) = sqrt( Product_{a=1..n} Product_{b=1..k} (4*sin((2*a-1)*Pi/(2*n))^2 + 4*sin((2*b-1)*Pi/k)^2) ).at n=31A341533
• Square array T(n,k), n >= 1, k >= 1, read by antidiagonals downwards: number of perfect matchings in the graph C_{2n} x C_k.at n=31A341741