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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.

A385471 Expansion of e.g.f. 1/(1 - 3 * arctanh(x)).

Table of values

n a(n)
0 1
1 3
2 18
3 168
4 2088
5 32472
6 605952
7 13192848
8 328268160
9 9189103104
10 285808290048
11 9778434400512
12 364965976571904
13 14756982055363584
14 642580290860378112
15 29979230177385750528
16 1491908801018949697536
17 78884742832151951278080
18 4416389166601900315901952

List of values

[1, 3, 18, 168, 2088, 32472, 605952, 13192848, 328268160, 9189103104, 285808290048, 9778434400512, 364965976571904, 14756982055363584, 642580290860378112, 29979230177385750528, 1491908801018949697536, 78884742832151951278080, 4416389166601900315901952]

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

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