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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.

A137359 a(n) = Sum_{k <= n/2 } k*binomial(n-2k, 3k).

Table of values

n a(n)
0 0
1 0
2 0
3 0
4 0
5 1
6 4
7 10
8 20
9 35
10 58
11 98
12 176
13 333
14 640
15 1213
16 2242
17 4052
18 7226
19 12835
20 22842
21 40788
22 72952
23 130344
24 232200
25 412190
26 729466
27 1288216
28 2272012
29 4003795
30 7050358
31 12404345
32 21801674
33 38275760
34 67125420
35 117604174
36 205865368
37 360090917
38 629414866

List of values

[0, 0, 0, 0, 0, 1, 4, 10, 20, 35, 58, 98, 176, 333, 640, 1213, 2242, 4052, 7226, 12835, 22842, 40788, 72952, 130344, 232200, 412190, 729466, 1288216, 2272012, 4003795, 7050358, 12404345, 21801674, 38275760, 67125420, 117604174, 205865368, 360090917, 629414866]

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

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