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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.

A274483 G.f. A(x) satisfies: A(x)^2 = A( x^2/(1 - 4*x - 2*x^2) ).

Table of values

n a(n)
1 1
2 2
3 8
4 32
5 138
6 612
7 2784
8 12896
9 60635
10 288614
11 1388104
12 6735808
13 32938438
14 162156828
15 803026176
16 3997462368
17 19991321445
18 100387500906
19 505950179016
20 2558352514272
21 12974595610122
22 65975538192036
23 336293496474144
24 1717927441213152
25 8793426613714734
26 45092543870052092
27 231621905868337424
28 1191586088094887936
29 6138909938284313524
30 31668826322371245256
31 163571372589617459584
32 845826517521629901888
33 4378463647900723645800

List of values

[1, 2, 8, 32, 138, 612, 2784, 12896, 60635, 288614, 1388104, 6735808, 32938438, 162156828, 803026176, 3997462368, 19991321445, 100387500906, 505950179016, 2558352514272, 12974595610122, 65975538192036, 336293496474144, 1717927441213152, 8793426613714734, 45092543870052092, 231621905868337424, 1191586088094887936, 6138909938284313524, 31668826322371245256, 163571372589617459584, 845826517521629901888, 4378463647900723645800]

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