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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.

A383582 a(n) = Sum_{k=0..floor(n/4)} binomial(n-3*k,k) * binomial(2*(n-4*k),n-4*k).

Table of values

n a(n)
0 1
1 2
2 6
3 20
4 71
5 256
6 942
7 3512
8 13221
9 50138
10 191260
11 733088
12 2821037
13 10892100
14 42174848
15 163706656
16 636816019
17 2481902842
18 9689155902
19 37882580356
20 148313102097
21 581365577564
22 2281393560802
23 8961689897248
24 35235582858441
25 138657185501870
26 546064549476476

List of values

[1, 2, 6, 20, 71, 256, 942, 3512, 13221, 50138, 191260, 733088, 2821037, 10892100, 42174848, 163706656, 636816019, 2481902842, 9689155902, 37882580356, 148313102097, 581365577564, 2281393560802, 8961689897248, 35235582858441, 138657185501870, 546064549476476]

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

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