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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.

A152773 3 times heptagonal numbers: a(n) = 3*n*(5*n-3)/2.

Table of values

n a(n)
0 0
1 3
2 21
3 54
4 102
5 165
6 243
7 336
8 444
9 567
10 705
11 858
12 1026
13 1209
14 1407
15 1620
16 1848
17 2091
18 2349
19 2622
20 2910
21 3213
22 3531
23 3864
24 4212
25 4575
26 4953
27 5346
28 5754
29 6177
30 6615
31 7068
32 7536
33 8019
34 8517
35 9030
36 9558
37 10101
38 10659
39 11232
40 11820
41 12423
42 13041
43 13674
44 14322
45 14985

List of values

[0, 3, 21, 54, 102, 165, 243, 336, 444, 567, 705, 858, 1026, 1209, 1407, 1620, 1848, 2091, 2349, 2622, 2910, 3213, 3531, 3864, 4212, 4575, 4953, 5346, 5754, 6177, 6615, 7068, 7536, 8019, 8517, 9030, 9558, 10101, 10659, 11232, 11820, 12423, 13041, 13674, 14322, 14985]

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

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