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.

A214402 Cancellation factor in reducing Sum_{k=0...n} n^k/k! to lowest terms.

Original entry on oeis.org

1, 2, 6, 8, 10, 144, 70, 128, 162, 6400, 22, 6220800, 26, 100352, 182250, 425984, 170, 429981696, 38, 163840000, 13502538, 317194240, 46, 247669456896, 31250, 1417674752, 15943230, 80564191232, 9802, 25076532510720000000, 62, 10737418240, 38196790434, 1241245548544
Offset: 1

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Author

Jonathan Sondow, Jul 15 2012

Keywords

Crossrefs

Programs

  • Mathematica
    Table[n!/Denominator[Sum[n^k/k!, {k, 0, n}]], {n, 1, 30}]
  • PARI
    a(n) = n!/denominator(sum(k=0, n, n^k/k!)); \\ Michel Marcus, Apr 20 2021

Formula

a(n) = n!/A214401(n).

Extensions

More terms from Michel Marcus, Apr 20 2021