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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.

A370608 a(n) = (n-1)! * Sum_{d|n} 1/((d-1)! * (n/d)!^(d-1)).

Table of values

n a(n)
1 1
2 2
3 3
4 10
5 25
6 156
7 721
8 5356
9 40881
10 366850
11 3628801
12 40048086
13 479001601
14 6228391456
15 87184121025
16 1307724593176
17 20922789888001
18 355689166978146
19 6402373705728001
20 121645161595446490
21 2432902128489747201
22 51090943465394571376
23 1124000727777607680001

List of values

[1, 2, 3, 10, 25, 156, 721, 5356, 40881, 366850, 3628801, 40048086, 479001601, 6228391456, 87184121025, 1307724593176, 20922789888001, 355689166978146, 6402373705728001, 121645161595446490, 2432902128489747201, 51090943465394571376, 1124000727777607680001]

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

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