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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.

A121860 a(n) = Sum_{d|n} n!/(d!*(n/d)!).

Table of values

n a(n)
1 1
2 2
3 2
4 8
5 2
6 122
7 2
8 1682
9 10082
10 30242
11 2
12 7318082
13 2
14 17297282
15 3632428802
16 36843206402
17 2
18 2981705126402
19 2
20 1690185726028802
21 3379030566912002
22 28158588057602
23 2
24 76941821303636889602
25 1077167364120207360002

List of values

[1, 2, 2, 8, 2, 122, 2, 1682, 10082, 30242, 2, 7318082, 2, 17297282, 3632428802, 36843206402, 2, 2981705126402, 2, 1690185726028802, 3379030566912002, 28158588057602, 2, 76941821303636889602, 1077167364120207360002]

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

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