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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.

A381820 Expansion of ( (1/x) * Series_Reversion( x * ((1-x) / C(x))^4 ) )^(1/4), where C(x) is the g.f. of A000108.

Table of values

n a(n)
0 1
1 2
2 20
3 281
4 4599
5 82113
6 1550993
7 30473930
8 616463800
9 12753523628
10 268586285058
11 5738804673016
12 124098812744140
13 2710824280371114
14 59728504549831296
15 1325862161472193292
16 29623682752417138511
17 665679666998856945540
18 15034747192791290846435

List of values

[1, 2, 20, 281, 4599, 82113, 1550993, 30473930, 616463800, 12753523628, 268586285058, 5738804673016, 124098812744140, 2710824280371114, 59728504549831296, 1325862161472193292, 29623682752417138511, 665679666998856945540, 15034747192791290846435]

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

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