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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.

A006004 a(n) = C(n+2,3) + C(n,3) + C(n-1,3).

Table of values

n a(n)
1 1
2 4
3 11
4 25
5 49
6 86
7 139
8 211
9 305
10 424
11 571
12 749
13 961
14 1210
15 1499
16 1831
17 2209
18 2636
19 3115
20 3649
21 4241
22 4894
23 5611
24 6395
25 7249
26 8176
27 9179
28 10261
29 11425
30 12674
31 14011
32 15439
33 16961
34 18580
35 20299
36 22121
37 24049
38 26086
39 28235
40 30499
41 32881
42 35384
43 38011
44 40765

List of values

[1, 4, 11, 25, 49, 86, 139, 211, 305, 424, 571, 749, 961, 1210, 1499, 1831, 2209, 2636, 3115, 3649, 4241, 4894, 5611, 6395, 7249, 8176, 9179, 10261, 11425, 12674, 14011, 15439, 16961, 18580, 20299, 22121, 24049, 26086, 28235, 30499, 32881, 35384, 38011, 40765]

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

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