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.

A361617 a(n) = n! * Sum_{k=0..n} binomial(n+(n-1)*(k+1),n-k)/k!.

Original entry on oeis.org

1, 2, 15, 214, 4721, 146046, 5958367, 307382090, 19459587009, 1478414285146, 132440451881231, 13787717744245182, 1647673524863409265, 223671725058601427414, 34184743554559413628191, 5837132027535188545269106, 1106136052471647285563082497
Offset: 0

Views

Author

Seiichi Manyama, Mar 18 2023

Keywords

Crossrefs

Main diagonal of A361616.
Cf. A361607.

Programs

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

Formula

a(n) = n! * [x^n] exp( x/(1-x)^n ) / (1-x)^n.
a(n) = Sum_{k=0..n} (n+(n-1)*(k+1))!/(n*k+n-1)! * binomial(n,k) for n > 0.