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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.

A307412 G.f. A(x) satisfies: A(x) = 1 + x*A(x)/(1 - 2*x*A(x) - x^2*A(x)^2).

Table of values

n a(n)
0 1
1 1
2 3
3 12
4 53
5 250
6 1234
7 6295
8 32925
9 175616
10 951596
11 5223658
12 28987546
13 162349759
14 916502869
15 5209630108
16 29792226533
17 171284524184
18 989460348216
19 5740230703588
20 33429379234924
21 195361236443008
22 1145312096390408
23 6733896357727242
24 39697441350016170
25 234596104853541967

List of values

[1, 1, 3, 12, 53, 250, 1234, 6295, 32925, 175616, 951596, 5223658, 28987546, 162349759, 916502869, 5209630108, 29792226533, 171284524184, 989460348216, 5740230703588, 33429379234924, 195361236443008, 1145312096390408, 6733896357727242, 39697441350016170, 234596104853541967]

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

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