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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.

A302609 a(n) = n! * [x^n] exp(n*x)*arctanh(x).

Table of values

n a(n)
0 0
1 1
2 4
3 29
4 288
5 3649
6 56160
7 1017029
8 21181440
9 498682881
10 13095232000
11 379443829709
12 12025239367680
13 413761766695809
14 15360425115176960
15 611958601019294325
16 26042588632355176448
17 1179009749826940037889
18 56579126414696034729984
19 2868848293506101088635389

List of values

[0, 1, 4, 29, 288, 3649, 56160, 1017029, 21181440, 498682881, 13095232000, 379443829709, 12025239367680, 413761766695809, 15360425115176960, 611958601019294325, 26042588632355176448, 1179009749826940037889, 56579126414696034729984, 2868848293506101088635389]

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

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