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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.

A241232 Number of acute triangles, distinct up to congruence, on a centered hexagonal grid of size n.

Table of values

n a(n)
1 0
2 2
3 14
4 49
5 134
6 296
7 580
8 1034
9 1720
10 2691
11 4043
12 5841
13 8193
14 11178
15 14935
16 19567
17 25197
18 31954
19 40006
20 49521
21 60596
22 73442
23 88238
24 105158
25 124432
26 146220
27 170802
28 198278
29 228999
30 263185
31 300988
32 342775
33 388775
34 439269
35 494462
36 554839
37 620474
38 691717
39 769060
40 852639

List of values

[0, 2, 14, 49, 134, 296, 580, 1034, 1720, 2691, 4043, 5841, 8193, 11178, 14935, 19567, 25197, 31954, 40006, 49521, 60596, 73442, 88238, 105158, 124432, 146220, 170802, 198278, 228999, 263185, 300988, 342775, 388775, 439269, 494462, 554839, 620474, 691717, 769060, 852639]

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

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