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.

A376049 a(n) is the denominator of the sum S(n) defined in A376048.

Original entry on oeis.org

1, 4, 20, 1620, 2626020, 34479907828020, 10699776394458828344981911620, 228970429782836729250563232145698649718622958323963960420, 314564746289621790478499809054644383073494124885364231904506529162346525698245870188461228508418377184391923418820
Offset: 0

Views

Author

N. J. A. Sloane, Sep 13 2024

Keywords

Examples

			The first few values of S(n) are 0/1, 3/4, 19/20, 1619/1620, 2626019/2626020, 34479907828019/34479907828020, ...
		

Crossrefs

Formula

a(n+1) = b(n+1)*a(n)^2 + a(n), with a(1) = 4, where b(n) is defined in A376048.

Extensions

a(0)=1 prepended by Alois P. Heinz, Oct 18 2024