A190310 - cp's OEIS frontend

A190310 Number of obtuse isosceles triangles, distinct up to congruence, on an n X n grid (or geoboard).

n	a(n)
1	0
2	0
3	0
4	1
5	3
6	5
7	9
8	12
9	19
10	24
11	32
12	37
13	51
14	57
15	69
16	80
17	99
18	107
19	127
20	136
21	161
22	176
23	196
24	207
25	246
26	262
27	286
28	306
29	343
30	357
31	399
32	414
33	460
34	485
35	517
36	544
37	605
38	623
39	659
40	689
41	757

[0, 0, 0, 1, 3, 5, 9, 12, 19, 24, 32, 37, 51, 57, 69, 80, 99, 107, 127, 136, 161, 176, 196, 207, 246, 262, 286, 306, 343, 357, 399, 414, 460, 485, 517, 544, 605, 623, 659, 689, 757]

cp's OEIS Frontend

A190310 Number of obtuse isosceles triangles, distinct up to congruence, on an n X n grid (or geoboard).

Table of values

List of values

n	a(n)
1	0
2	0
3	0
4	1
5	3
6	5
7	9
8	12
9	19
10	24
11	32
12	37
13	51
14	57
15	69
16	80
17	99
18	107
19	127
20	136
21	161
22	176
23	196
24	207
25	246
26	262
27	286
28	306
29	343
30	357
31	399
32	414
33	460
34	485
35	517
36	544
37	605
38	623
39	659
40	689
41	757

n	a(n)
1	0
2	0
3	0
4	1
5	3
6	5
7	9
8	12
9	19
10	24
11	32
12	37
13	51
14	57
15	69
16	80
17	99
18	107
19	127
20	136
21	161
22	176
23	196
24	207
25	246
26	262
27	286
28	306
29	343
30	357
31	399
32	414
33	460
34	485
35	517
36	544
37	605
38	623
39	659
40	689
41	757

n	a(n)
1	0
2	0
3	0
4	1
5	3
6	5
7	9
8	12
9	19
10	24
11	32
12	37
13	51
14	57
15	69
16	80
17	99
18	107
19	127
20	136
21	161
22	176
23	196
24	207
25	246
26	262
27	286
28	306
29	343
30	357
31	399
32	414
33	460
34	485
35	517
36	544
37	605
38	623
39	659
40	689
41	757