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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.

A326604 G.f. A(x) satisfies x / Series_Reversion(x*A(x)) = (2*A(x) + 1+x)/3.

Table of values

n a(n)
0 1
1 1
2 3
3 21
4 231
5 3333
6 58167
7 1175877
8 26827623
9 679078677
10 18844334727
11 568229240901
12 18491559492999
13 645850960844469
14 24099045218945031
15 956889503377128261
16 40291822946545245927
17 1793614919867776690389
18 84177429562216608349959
19 4154548653801498090246597
20 215137302566817565660007367
21 11664210072689092804458508533

List of values

[1, 1, 3, 21, 231, 3333, 58167, 1175877, 26827623, 679078677, 18844334727, 568229240901, 18491559492999, 645850960844469, 24099045218945031, 956889503377128261, 40291822946545245927, 1793614919867776690389, 84177429562216608349959, 4154548653801498090246597, 215137302566817565660007367, 11664210072689092804458508533]

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

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