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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.

A383526 a(n) = Sum_{k=0..floor(n/3)} binomial(n,k) * binomial(n-2*k,k)^2.

Table of values

n a(n)
0 1
1 1
2 1
3 4
4 17
5 46
6 112
7 365
8 1297
9 4126
10 12686
11 41647
12 141440
13 470887
14 1553021
15 5205769
16 17665105
17 59858038
18 202599814
19 689183087
20 2355887902
21 8065291637
22 27637715887
23 94924591313
24 326810899744
25 1126888746871
26 3890420726167
27 13450563963085
28 46571447873597

List of values

[1, 1, 1, 4, 17, 46, 112, 365, 1297, 4126, 12686, 41647, 141440, 470887, 1553021, 5205769, 17665105, 59858038, 202599814, 689183087, 2355887902, 8065291637, 27637715887, 94924591313, 326810899744, 1126888746871, 3890420726167, 13450563963085, 46571447873597]

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

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