537636

Appears in sequences

• Number of perfect matchings in the graph C_4 X C_n.at n=7A220864
• a(n) = 6 + 4*(-1)^n + (2+sqrt(3))^n + (2-sqrt(3))^n + 2*(1+sqrt(2))^n + 2*(1-sqrt(2))^n.at n=10A232999
• a(1) = 2, a(n) = smallest number > a(n-1) such that the concatenation of a(n-1) and a(n) is a square.at n=9A265147
• Number of perfect matchings in the graph C_10 X C_n.at n=1A281679
• 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=32A341741