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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.

A356589 a(n) = n! * Sum_{k=1..n} sigma_k(k)/(k * (n-k)!).

Table of values

n a(n)
1 1
2 7
3 74
4 1896
5 83829
6 6169915
7 634444586
8 89796130088
9 16407420884385
10 3792452363345383
11 1076168167972120354
12 368657061467873013440
13 149787334364400115372677
14 71262783791831946810277899
15 39228224120114488162020163762

List of values

[1, 7, 74, 1896, 83829, 6169915, 634444586, 89796130088, 16407420884385, 3792452363345383, 1076168167972120354, 368657061467873013440, 149787334364400115372677, 71262783791831946810277899, 39228224120114488162020163762]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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