cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A377745 E.g.f. satisfies A(x) = exp(x) / (1 - x * A(x)^2)^2.

Original entry on oeis.org

1, 3, 35, 865, 32917, 1699311, 111033607, 8788108477, 817439352233, 87406186549339, 10564550856634411, 1424421297360350169, 211968687043802337469, 34509326697582566247367, 6101526326400539736369935, 1164298084658023787974823221, 238495519792465232104337607505
Offset: 0

Views

Author

Seiichi Manyama, Nov 06 2024

Keywords

Crossrefs

Programs

  • PARI
    a(n) = n!*sum(k=0, n, (2*k+1)^(n-k-1)*binomial(5*k+1, k)/(n-k)!);

Formula

a(n) = n! * Sum_{k=0..n} (2*k+1)^(n-k-1) * binomial(5*k+1,k)/(n-k)!.