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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.

A250887 G.f. A(x) satisfies: x = A(x) * (1 + A(x)) * (1 - 3*A(x)).

Table of values

n a(n)
1 1
2 2
3 11
4 70
5 503
6 3864
7 31092
8 258654
9 2206655
10 19200610
11 169739843
12 1520241320
13 13764959908
14 125792608400
15 1158745944312
16 10747830197070
17 100295912869263
18 940958196049830
19 8870071185895425
20 83972749650989430
21 798033019890224415
22 7610570090722324320
23 72810031747355657040

List of values

[1, 2, 11, 70, 503, 3864, 31092, 258654, 2206655, 19200610, 169739843, 1520241320, 13764959908, 125792608400, 1158745944312, 10747830197070, 100295912869263, 940958196049830, 8870071185895425, 83972749650989430, 798033019890224415, 7610570090722324320, 72810031747355657040]

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

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