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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.

A386613 a(n) = Sum_{k=0..n-1} binomial(5*k,k) * binomial(5*n-5*k,n-k-1).

Table of values

n a(n)
0 0
1 1
2 15
3 200
4 2570
5 32470
6 406411
7 5057440
8 62692100
9 775007135
10 9561421830
11 117780193480
12 1449107627450
13 17811990468400
14 218768774024360
15 2685209277718320
16 32940971570389960
17 403920568087927025
18 4950915045235523125
19 60663591616305306320
20 743092566613017730980
21 9100088494955802407060

List of values

[0, 1, 15, 200, 2570, 32470, 406411, 5057440, 62692100, 775007135, 9561421830, 117780193480, 1449107627450, 17811990468400, 218768774024360, 2685209277718320, 32940971570389960, 403920568087927025, 4950915045235523125, 60663591616305306320, 743092566613017730980, 9100088494955802407060]

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

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