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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.

A011849 a(n) = floor(binomial(n,3)/3).

Table of values

n a(n)
0 0
1 0
2 0
3 0
4 1
5 3
6 6
7 11
8 18
9 28
10 40
11 55
12 73
13 95
14 121
15 151
16 186
17 226
18 272
19 323
20 380
21 443
22 513
23 590
24 674
25 766
26 866
27 975
28 1092
29 1218
30 1353
31 1498
32 1653
33 1818
34 1994
35 2181
36 2380
37 2590
38 2812
39 3046
40 3293
41 3553
42 3826

List of values

[0, 0, 0, 0, 1, 3, 6, 11, 18, 28, 40, 55, 73, 95, 121, 151, 186, 226, 272, 323, 380, 443, 513, 590, 674, 766, 866, 975, 1092, 1218, 1353, 1498, 1653, 1818, 1994, 2181, 2380, 2590, 2812, 3046, 3293, 3553, 3826]

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

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