409713

Appears in sequences

• Expansion of e.g.f. exp(x)*(tan(x)+sec(x))^2.at n=9A292756
• Square array A(n,k), n >= 0, k >= 0, read by antidiagonals, where column k is the expansion of e.g.f. exp(x)*(sec(x) + tan(x))^k.at n=75A322268