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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.

A386566 a(n) = Sum_{k=0..n-1} binomial(5*k-1,k) * binomial(5*n-5*k,n-k-1).

Table of values

n a(n)
0 0
1 1
2 14
3 181
4 2284
5 28506
6 353630
7 4370584
8 53882392
9 663116347
10 8150224204
11 100073884670
12 1227826127020
13 15055154471696
14 184508186225552
15 2260299193652496
16 27679951219660080
17 338872887728053465
18 4147618793911034330
19 50753529798492061819
20 620942367878256638264

List of values

[0, 1, 14, 181, 2284, 28506, 353630, 4370584, 53882392, 663116347, 8150224204, 100073884670, 1227826127020, 15055154471696, 184508186225552, 2260299193652496, 27679951219660080, 338872887728053465, 4147618793911034330, 50753529798492061819, 620942367878256638264]

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

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