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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.

A241231 Number of triangles, distinct up to congruence, on a centered hexagonal grid of size n.

Table of values

n a(n)
1 0
2 4
3 34
4 134
5 379
6 866
7 1718
8 3085
9 5149
10 8095
11 12188
12 17664
13 24781
14 33861
15 45269
16 59327
17 76461
18 97017
19 121458
20 150379
21 184053
22 223137
23 268117
24 319578
25 378132
26 444455
27 519178
28 602675
29 696102
30 800051
31 914995
32 1042094
33 1181858
34 1335414
35 1503251
36 1686811
37 1886417
38 2103007

List of values

[0, 4, 34, 134, 379, 866, 1718, 3085, 5149, 8095, 12188, 17664, 24781, 33861, 45269, 59327, 76461, 97017, 121458, 150379, 184053, 223137, 268117, 319578, 378132, 444455, 519178, 602675, 696102, 800051, 914995, 1042094, 1181858, 1335414, 1503251, 1686811, 1886417, 2103007]

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

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