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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.

A381568 G.f. A(x) satisfies A(x) = (1 + x*A(x*A(x)))^2.

Table of values

n a(n)
0 1
1 2
2 5
3 22
4 126
5 884
6 7149
7 64688
8 641836
9 6888740
10 79203860
11 968503090
12 12525131474
13 170555767116
14 2436592516874
15 36409825487380
16 567612675812796
17 9211031425896752
18 155283809480528788
19 2714788300934206360
20 49140787009610861896
21 919625415852055598804
22 17768937720619971300781

List of values

[1, 2, 5, 22, 126, 884, 7149, 64688, 641836, 6888740, 79203860, 968503090, 12525131474, 170555767116, 2436592516874, 36409825487380, 567612675812796, 9211031425896752, 155283809480528788, 2714788300934206360, 49140787009610861896, 919625415852055598804, 17768937720619971300781]

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

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