cp's OEIS Frontend

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.

A190019 Number of acute triangles on an n X n grid (or geoboard).

Table of values

n a(n)
1 0
2 0
3 8
4 80
5 404
6 1392
7 3880
8 9208
9 19536
10 38096
11 69288
12 119224
13 196036
14 310008
15 474336
16 705328
17 1023216
18 1451904
19 2020232
20 2762848
21 3719420
22 4937200
23 6469424
24 8378184
25 10734664
26 13618168
27 17119288
28 21338760
29 26390452
30 32400592
31 39508656
32 47870200
33 57655752

List of values

[0, 0, 8, 80, 404, 1392, 3880, 9208, 19536, 38096, 69288, 119224, 196036, 310008, 474336, 705328, 1023216, 1451904, 2020232, 2762848, 3719420, 4937200, 6469424, 8378184, 10734664, 13618168, 17119288, 21338760, 26390452, 32400592, 39508656, 47870200, 57655752]

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

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