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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.

A270386 Expansion of (4/(3*x/(1-x))) * sin((1/3)*arcsin(sqrt(27*x/4/(1-x))))^2.

Table of values

n a(n)
0 1
1 2
2 9
3 46
4 256
5 1510
6 9283
7 58848
8 381963
9 2525916
10 16958498
11 115288674
12 792042589
13 5490312864
14 38352695246
15 269719400974
16 1908059370583
17 13568804436340
18 96942782340802
19 695513575242284
20 5008808999633736
21 36195063931874308
22 262372258663337954

List of values

[1, 2, 9, 46, 256, 1510, 9283, 58848, 381963, 2525916, 16958498, 115288674, 792042589, 5490312864, 38352695246, 269719400974, 1908059370583, 13568804436340, 96942782340802, 695513575242284, 5008808999633736, 36195063931874308, 262372258663337954]

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

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