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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.

A277378 Expansion of e.g.f. exp(2*x/(1-x))/sqrt(1-x^2).

Table of values

n a(n)
0 1
1 2
2 9
3 50
4 361
5 3042
6 29929
7 331298
8 4100625
9 55777922
10 828691369
11 13316140818
12 230256982201
13 4257449540450
14 83834039024649
15 1750225301567618
16 38614608429012001
17 897325298084953602
18 21904718673762721225
19 560258287738117292018
20 14981472258320814527241

List of values

[1, 2, 9, 50, 361, 3042, 29929, 331298, 4100625, 55777922, 828691369, 13316140818, 230256982201, 4257449540450, 83834039024649, 1750225301567618, 38614608429012001, 897325298084953602, 21904718673762721225, 560258287738117292018, 14981472258320814527241]

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

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