A190022 - cp's OEIS frontend

A190022 Number of obtuse triangles, distinct up to congruence, on an n X n grid (or geoboard).

n	a(n)
1	0
2	0
3	2
4	12
5	39
6	95
7	193
8	355
9	597
10	943
11	1426
12	2071
13	2904
14	3977
15	5306
16	6956
17	8963
18	11370
19	14225
20	17587
21	21515
22	26053
23	31310
24	37282
25	44061
26	51785
27	60436
28	70127
29	80939
30	92952
31	106267
32	120982
33	137124
34	154841
35	174225
36	195366
37	218394
38	243457
39	270505
40	299749
41	331441

[0, 0, 2, 12, 39, 95, 193, 355, 597, 943, 1426, 2071, 2904, 3977, 5306, 6956, 8963, 11370, 14225, 17587, 21515, 26053, 31310, 37282, 44061, 51785, 60436, 70127, 80939, 92952, 106267, 120982, 137124, 154841, 174225, 195366, 218394, 243457, 270505, 299749, 331441]

cp's OEIS Frontend

A190022 Number of obtuse triangles, distinct up to congruence, on an n X n grid (or geoboard).

Table of values

List of values