A379257 G.f. A(x) satisfies A(x) = 1 + x * A(x)^3 * (1 + A(x)^7).

1, 2, 26, 530, 12850, 342370, 9684010, 285483666, 8675363298, 269823659586, 8547536496442, 274825739078930, 8945617644054546, 294204116545534370, 9761360051405903434, 326339380099797219474, 10982521821776648986050, 371758494418806559639170

Offset: 0

Author

Seiichi Manyama, Dec 19 2024

Keywords

• nonn

Crossrefs

Cf. A379256.

Programs

PARI

a(n) = sum(k=0, n, binomial(n, k)*binomial(3*n+7*k+1, n)/(3*n+7*k+1));

Formula

a(n) = Sum_{k=0..n} binomial(n,k) * binomial(3*n+7*k+1,n)/(3*n+7*k+1).