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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.

A275756 G.f. satisfies: A(x) = x + A( A(x)^2 - A(x)^6 ).

Table of values

n a(n)
1 1
2 1
3 2
4 6
5 20
6 71
7 264
8 1018
9 4032
10 16305
11 67042
12 279444
13 1178088
14 5014596
15 21521488
16 93027025
17 404630318
18 1769704106
19 7778030834
20 34335337802
21 152168657438
22 676796514510
23 3019945599904
24 13515300673984
25 60649985907334
26 272847379282493
27 1230295797205452
28 5559373120441048
29 25171114275512520
30 114177375142080814
31 518806321789317040
32 2361183952087172306
33 10762422470020855820
34 49125407360603361370
35 224533932290057629076
36 1027553322543206612019
37 4708070541211739962738
38 21595828228486254332762

List of values

[1, 1, 2, 6, 20, 71, 264, 1018, 4032, 16305, 67042, 279444, 1178088, 5014596, 21521488, 93027025, 404630318, 1769704106, 7778030834, 34335337802, 152168657438, 676796514510, 3019945599904, 13515300673984, 60649985907334, 272847379282493, 1230295797205452, 5559373120441048, 25171114275512520, 114177375142080814, 518806321789317040, 2361183952087172306, 10762422470020855820, 49125407360603361370, 224533932290057629076, 1027553322543206612019, 4708070541211739962738, 21595828228486254332762]

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