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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A367427 Expansion of e.g.f. 1 / (1 + log(1 - 4*x))^(3/4).

Original entry on oeis.org

1, 3, 33, 579, 13857, 419427, 15344769, 658225635, 32388324801, 1798082759235, 111173908726881, 7575821838083331, 564099365435411169, 45567223702943324067, 3968829692958916703169, 370764641464637535547299, 36980399763333881818665345
Offset: 0

Views

Author

Seiichi Manyama, Nov 18 2023

Keywords

Crossrefs

Cf. A367429.

Programs

  • PARI
    a(n) = sum(k=0, n, 4^(n-k)*prod(j=0, k-1, 4*j+3)*abs(stirling(n, k, 1)));

Formula

a(n) = Sum_{k=0..n} 4^(n-k) * (Product_{j=0..k-1} (4*j+3)) * |Stirling1(n,k)|.
a(0) = 1; a(n) = Sum_{k=1..n} 4^k * (1 - 1/4 * k/n) * (k-1)! * binomial(n,k) * a(n-k).
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