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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.

A226910 a(n) = Sum_{k=0..floor(n/5)} binomial(n,5*k)*binomial(6*k,k)/(5*k+1).

Table of values

n a(n)
0 1
1 1
2 1
3 1
4 1
5 2
6 7
7 22
8 57
9 127
10 259
11 529
12 1189
13 3004
14 8009
15 21073
16 53233
17 129813
18 312733
19 763573
20 1915251
21 4914736
22 12720841
23 32800186
24 83869501
25 213261712
26 542609237
27 1388542312
28 3579043987
29 9273567337
30 24075321925
31 62475528190
32 161969731985
33 419914766965

List of values

[1, 1, 1, 1, 1, 2, 7, 22, 57, 127, 259, 529, 1189, 3004, 8009, 21073, 53233, 129813, 312733, 763573, 1915251, 4914736, 12720841, 32800186, 83869501, 213261712, 542609237, 1388542312, 3579043987, 9273567337, 24075321925, 62475528190, 161969731985, 419914766965]

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

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