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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.

A013155 Expansion of e.g.f. exp(arctanh(x)+log(x+1)).

Table of values

n a(n)
0 1
1 2
2 3
3 6
4 21
5 90
6 495
7 3150
8 23625
9 198450
10 1885275
11 19646550
12 225935325
13 2809456650
14 37927664775
15 547844046750
16 8491582724625
17 139700231921250
18 2444754058621875
19 45123174910563750
20 879901910755993125
21 18004146789314936250
22 387089155970271129375
23 8696002899239114208750

List of values

[1, 2, 3, 6, 21, 90, 495, 3150, 23625, 198450, 1885275, 19646550, 225935325, 2809456650, 37927664775, 547844046750, 8491582724625, 139700231921250, 2444754058621875, 45123174910563750, 879901910755993125, 18004146789314936250, 387089155970271129375, 8696002899239114208750]

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

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