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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.

A373906 a(n) = Sum_{k=0..floor(n/4)} binomial(n+2*k,n-4*k).

Table of values

n a(n)
0 1
1 1
2 1
3 1
4 2
5 8
6 29
7 85
8 212
9 476
10 1016
11 2172
12 4825
13 11213
14 26763
15 64095
16 151851
17 354737
18 820328
19 1889968
20 4361521
21 10106859
22 23509678
23 54793282
24 127709888
25 297336790
26 691382201
27 1606284377
28 3731020629
29 8668253125
30 20146856893
31 46840732201
32 108918637566
33 253262275888

List of values

[1, 1, 1, 1, 2, 8, 29, 85, 212, 476, 1016, 2172, 4825, 11213, 26763, 64095, 151851, 354737, 820328, 1889968, 4361521, 10106859, 23509678, 54793282, 127709888, 297336790, 691382201, 1606284377, 3731020629, 8668253125, 20146856893, 46840732201, 108918637566, 253262275888]

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

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