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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.

A036719 G.f. satisfies A(x) = 1 + x*cycle_index(Cyclic(4), A(x)).

Table of values

n a(n)
0 1
1 1
2 1
3 3
4 7
5 22
6 65
7 212
8 697
9 2372
10 8179
11 28703
12 101851
13 365393
14 1322034
15 4820378
16 17691018
17 65306700
18 242317423
19 903242615
20 3380707920
21 12700575742
22 47874113728
23 181013422393
24 686341240781
25 2609093456212
26 9941953711409

List of values

[1, 1, 1, 3, 7, 22, 65, 212, 697, 2372, 8179, 28703, 101851, 365393, 1322034, 4820378, 17691018, 65306700, 242317423, 903242615, 3380707920, 12700575742, 47874113728, 181013422393, 686341240781, 2609093456212, 9941953711409]

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

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