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.

A273655 Number of forests of labeled rooted trees of height at most 1, with n labels, five of which are used for root nodes and any root may contain >= 1 labels.

Original entry on oeis.org

52, 906, 9891, 87416, 686826, 5020092, 35006202, 236460312, 1562226237, 10158790642, 65294141913, 415967090448, 2631510433188, 16551428673528, 103578621308388, 645186720537744, 4000912828433199, 24700465510596414, 151810205132056779, 928768921758036744
Offset: 5

Views

Author

Alois P. Heinz, May 27 2016

Keywords

Crossrefs

Column k=5 of A143396.

Programs

  • Maple
    a:= n-> binomial(n,5)*add(Stirling2(5,j)*j^(n-5), j=0..5):
    seq(a(n), n=5..40);

Formula

E.g.f.: x^5/5! * Sum_{j=0..5} Stirling2(5,j)*exp(x)^j.
a(n) = C(n,5) * Sum_{j=0..5} Stirling2(5,j) * j^(n-5).