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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.

A386367 a(n) = Sum_{k=0..n-1} binomial(5*k,k) * binomial(5*n-5*k-2,n-k-1).

Table of values

n a(n)
0 0
1 1
2 13
3 163
4 2021
5 24930
6 306655
7 3765448
8 46182101
9 565939603
10 6931070490
11 84845250370
12 1038235255415
13 12700966517968
14 155336699256808
15 1899439862390640
16 23222289820948405
17 283872591297526505
18 3469680960837171415
19 42404345427419774621
20 518193229118757697930

List of values

[0, 1, 13, 163, 2021, 24930, 306655, 3765448, 46182101, 565939603, 6931070490, 84845250370, 1038235255415, 12700966517968, 155336699256808, 1899439862390640, 23222289820948405, 283872591297526505, 3469680960837171415, 42404345427419774621, 518193229118757697930]

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

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