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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.

A331329 a(n) = binomial(5*n, n)*hypergeom([-4*n, -n], [-5*n], -1).

Table of values

n a(n)
0 1
1 9
2 145
3 2625
4 50049
5 982729
6 19665841
7 398796225
8 8166636545
9 168502295625
10 3497529199185
11 72949645000065
12 1527671538372225
13 32100078290806665
14 676451066002195825
15 14290577765009652865
16 302557549412667613185
17 6417968867896642617225
18 136371773642235542394385

List of values

[1, 9, 145, 2625, 50049, 982729, 19665841, 398796225, 8166636545, 168502295625, 3497529199185, 72949645000065, 1527671538372225, 32100078290806665, 676451066002195825, 14290577765009652865, 302557549412667613185, 6417968867896642617225, 136371773642235542394385]

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

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