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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.

A383538 a(n) = Sum_{k=0..floor(n/4)} binomial(n+k,k)^2 * binomial(n-3*k,k).

Table of values

n a(n)
0 1
1 1
2 1
3 1
4 26
5 73
6 148
7 257
8 2431
9 9676
10 26984
11 61993
12 332762
13 1487886
14 5029676
15 13986049
16 57394823
17 253491517
18 953613991
19 3032424076
20 11249004334
21 47032861778
22 185321607072
23 645015386921
24 2340940921276
25 9321743657318
26 37091865274327
27 136525692171310

List of values

[1, 1, 1, 1, 26, 73, 148, 257, 2431, 9676, 26984, 61993, 332762, 1487886, 5029676, 13986049, 57394823, 253491517, 953613991, 3032424076, 11249004334, 47032861778, 185321607072, 645015386921, 2340940921276, 9321743657318, 37091865274327, 136525692171310]

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

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