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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.

A212260 G.f. A(x) satisfies A(x)+A(x)^2+A(x)^3 = (1-sqrt(1-4*x))/2.

Table of values

n a(n)
0 0
1 1
2 0
3 1
4 3
5 5
6 22
7 64
8 198
9 710
10 2332
11 8105
12 28665
13 100653
14 361104
15 1301180
16 4713267
17 17217021
18 63140534
19 232702261
20 861507251
21 3200666821
22 11933894310
23 44636509320
24 167427781950
25 629691033738
26 2373987233286
27 8970240131032
28 33965443165016
29 128857452216256

List of values

[0, 1, 0, 1, 3, 5, 22, 64, 198, 710, 2332, 8105, 28665, 100653, 361104, 1301180, 4713267, 17217021, 63140534, 232702261, 861507251, 3200666821, 11933894310, 44636509320, 167427781950, 629691033738, 2373987233286, 8970240131032, 33965443165016, 128857452216256]

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

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