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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.

A226974 a(n) = Sum_{k=0..floor(n/3)} binomial(n,3*k)*binomial(4*k,k)/(3*k+1).

Table of values

n a(n)
0 1
1 1
2 1
3 2
4 5
5 11
6 25
7 64
8 169
9 443
10 1181
11 3224
12 8897
13 24701
14 69161
15 195255
16 554577
17 1583109
18 4541461
19 13086574
20 37856437
21 109892403
22 320034309
23 934774902
24 2737689189
25 8037746691
26 23652564261
27 69749727716
28 206091735797
29 610061655665
30 1808962146529

List of values

[1, 1, 1, 2, 5, 11, 25, 64, 169, 443, 1181, 3224, 8897, 24701, 69161, 195255, 554577, 1583109, 4541461, 13086574, 37856437, 109892403, 320034309, 934774902, 2737689189, 8037746691, 23652564261, 69749727716, 206091735797, 610061655665, 1808962146529]

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

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