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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.

A354338 a(n) = n! * Sum_{k=1..n} ( Sum_{d|k} 1/(d * (k/d)!) )/(n-k)!.

Table of values

n a(n)
1 1
2 4
3 12
4 41
5 145
6 742
7 3962
8 27659
9 215131
10 1996356
11 17300360
12 218809109
13 2421142269
14 31105286682
15 427776526574
16 6964677268087
17 97708052695959
18 1856379196278120
19 30362097934331500
20 606395795174882161
21 12016899266310773097
22 261771941015999635310

List of values

[1, 4, 12, 41, 145, 742, 3962, 27659, 215131, 1996356, 17300360, 218809109, 2421142269, 31105286682, 427776526574, 6964677268087, 97708052695959, 1856379196278120, 30362097934331500, 606395795174882161, 12016899266310773097, 261771941015999635310]

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

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