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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.

A354898 a(n) = n! * Sum_{d|n} d^(n - d) / (d! * (n/d)!).

Table of values

n a(n)
1 1
2 2
3 2
4 26
5 2
6 2582
7 2
8 268802
9 7348322
10 51120722
11 2
12 299332756802
13 2
14 7157951760962
15 18701679546950402
16 613777679843328002
17 2
18 3250742570192384467202
19 2
20 29411516073133093829529602
21 1146522800008167069616128002
22 4017001663590220290585602
23 2

List of values

[1, 2, 2, 26, 2, 2582, 2, 268802, 7348322, 51120722, 2, 299332756802, 2, 7157951760962, 18701679546950402, 613777679843328002, 2, 3250742570192384467202, 2, 29411516073133093829529602, 1146522800008167069616128002, 4017001663590220290585602, 2]

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

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