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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.

A274479 G.f. satisfies: A(x)^2 = A( x^2/(1 - 2*x - 4*x^2) ).

Table of values

n a(n)
1 1
2 1
3 4
4 10
5 34
6 106
7 361
8 1219
9 4252
10 14932
11 53263
12 191533
13 695233
14 2540617
15 9344050
16 34546672
17 128330533
18 478653973
19 1791816967
20 6729202603
21 25344884479
22 95707901503
23 362269464487
24 1374203633335
25 5223097370170
26 19888174932226
27 75856437036451
28 289780169876749
29 1108607284380835
30 4246966803249139
31 16290547536335716
32 62562701811659506
33 240540845892246253
34 925825162823212429
35 3567069859670052457
36 13756707569545384033

List of values

[1, 1, 4, 10, 34, 106, 361, 1219, 4252, 14932, 53263, 191533, 695233, 2540617, 9344050, 34546672, 128330533, 478653973, 1791816967, 6729202603, 25344884479, 95707901503, 362269464487, 1374203633335, 5223097370170, 19888174932226, 75856437036451, 289780169876749, 1108607284380835, 4246966803249139, 16290547536335716, 62562701811659506, 240540845892246253, 925825162823212429, 3567069859670052457, 13756707569545384033]

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