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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.

A291743 G.f. A(x) satisfies: A(x - 2*x*A(x)) = x + x*A(x).

Table of values

n a(n)
1 1
2 3
3 21
4 213
5 2649
6 37683
7 591345
8 10018881
9 180728985
10 3438000843
11 68495707461
12 1421921135541
13 30636666967857
14 683015673332955
15 15717420795468609
16 372590181990474273
17 9083851303291071633
18 227458241320778287731
19 5842792897560424283157
20 153812115285865111498869
21 4146016380695723021134761
22 114341728157990237568733731
23 3224107003868451067670682993

List of values

[1, 3, 21, 213, 2649, 37683, 591345, 10018881, 180728985, 3438000843, 68495707461, 1421921135541, 30636666967857, 683015673332955, 15717420795468609, 372590181990474273, 9083851303291071633, 227458241320778287731, 5842792897560424283157, 153812115285865111498869, 4146016380695723021134761, 114341728157990237568733731, 3224107003868451067670682993]

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

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