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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.

A227852 G.f. A(x) satisfies: A(x) = Series_Reversion( x - (A(x)^2 + A(-x)^2)/2 ).

Table of values

n a(n)
1 1
2 1
3 2
4 10
5 44
6 294
7 1728
8 13389
9 93130
10 796620
11 6235288
12 57551130
13 493813936
14 4857378920
15 44989814920
16 468103507718
17 4633862094852
18 50749496457992
19 533271010341720
20 6126256486912776
21 67990630238066888
22 817168635245112432
23 9541543704324657008
24 119719059789052412360

List of values

[1, 1, 2, 10, 44, 294, 1728, 13389, 93130, 796620, 6235288, 57551130, 493813936, 4857378920, 44989814920, 468103507718, 4633862094852, 50749496457992, 533271010341720, 6126256486912776, 67990630238066888, 817168635245112432, 9541543704324657008, 119719059789052412360]

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

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