A190309 - cp's OEIS frontend

A190309 Number of acute isosceles triangles, distinct up to congruence, on an n X n grid (or geoboard).

n	a(n)
1	0
2	0
3	2
4	5
5	11
6	19
7	29
8	40
9	58
10	74
11	94
12	113
13	141
14	168
15	201
16	227
17	267
18	304
19	348
20	390
21	438
22	483
23	537
24	590
25	657
26	709
27	776
28	837
29	913
30	979
31	1057
32	1130
33	1225
34	1299
35	1396
36	1472
37	1576
38	1663
39	1768
40	1863
41	1974

[0, 0, 2, 5, 11, 19, 29, 40, 58, 74, 94, 113, 141, 168, 201, 227, 267, 304, 348, 390, 438, 483, 537, 590, 657, 709, 776, 837, 913, 979, 1057, 1130, 1225, 1299, 1396, 1472, 1576, 1663, 1768, 1863, 1974]

cp's OEIS Frontend

A190309 Number of acute isosceles triangles, distinct up to congruence, on an n X n grid (or geoboard).

Table of values

List of values