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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.

A241234 Number of obtuse triangles, distinct up to congruence, on a centered hexagonal grid of size n.

Table of values

n a(n)
1 0
2 1
3 15
4 72
5 220
6 528
7 1076
8 1965
9 3314
10 5254
11 7954
12 11589
13 16306
14 22349
15 29939
16 39305
17 50738
18 64462
19 80775
20 100096
21 122602
22 148748
23 178834
24 213268
25 252439
26 296857
27 346878
28 402778
29 465346
30 534966
31 611966
32 697143
33 790749
34 893638
35 1006128
36 1129134
37 1262932
38 1408116
39 1565674

List of values

[0, 1, 15, 72, 220, 528, 1076, 1965, 3314, 5254, 7954, 11589, 16306, 22349, 29939, 39305, 50738, 64462, 80775, 100096, 122602, 148748, 178834, 213268, 252439, 296857, 346878, 402778, 465346, 534966, 611966, 697143, 790749, 893638, 1006128, 1129134, 1262932, 1408116, 1565674]

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

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