A189978 - cp's OEIS frontend

A189978 Number of isosceles triangles, distinct up to congruence, on an n X n grid (or geoboard).

n	a(n)
1	0
2	1
3	5
4	11
5	22
6	35
7	53
8	70
9	100
10	126
11	159
12	188
13	237
14	276
15	328
16	372
17	439
18	491
19	564
20	623
21	706
22	775
23	859
24	931
25	1049
26	1129
27	1231
28	1323
29	1448
30	1540
31	1674
32	1772
33	1928
34	2041
35	2183
36	2301
37	2483
38	2602
39	2758
40	2898
41	3095

[0, 1, 5, 11, 22, 35, 53, 70, 100, 126, 159, 188, 237, 276, 328, 372, 439, 491, 564, 623, 706, 775, 859, 931, 1049, 1129, 1231, 1323, 1448, 1540, 1674, 1772, 1928, 2041, 2183, 2301, 2483, 2602, 2758, 2898, 3095]

cp's OEIS Frontend

A189978 Number of isosceles triangles, distinct up to congruence, on an n X n grid (or geoboard).

Table of values

List of values