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.

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A377395 Expansion of e.g.f. (1 - log(1-x))^4.

Original entry on oeis.org

1, 4, 16, 68, 324, 1776, 11208, 80664, 654600, 5926080, 59283552, 649972704, 7754418528, 100047107520, 1388392475328, 20625806330496, 326648173136256, 5494182397387776, 97821610887785472, 1838137437962182656, 36354781509406470144, 754959568444846387200
Offset: 0

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Author

Seiichi Manyama, Oct 27 2024

Keywords

Crossrefs

Programs

  • PARI
    a(n) = sum(k=0, 4, k!*binomial(4, k)*abs(stirling(n, k, 1)));

Formula

a(n) = Sum_{k=0..4} k! * binomial(4,k) * |Stirling1(n,k)|.
a(0) = 1; a(n) = Sum_{k=1..n} (5 * k/n - 1) * (k-1)! * binomial(n,k) * a(n-k).
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