A272624 - cp's OEIS frontend

A272624 Array read by antidiagonals: T(n,k) = number of ways to choose 3 distinct points from an n X k rectangular grid so that they form an obtuse isosceles triangle of nonzero area.

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	0
7	0
8	0
9	0
10	0
11	0
12	0
13	0
14	0
15	0
16	0
17	2
18	0
19	0
20	2
21	0
22	0
23	4
24	4
25	4
26	4
27	4
28	0
29	0
30	8
31	8
32	14
33	14
34	8
35	8
36	0
37	0
38	12
39	18
40	24
41	36
42	24
43	18
44	12
45	0
46	0
47	18
48	28
49	44
50	58
51	58
52	44
53	28
54	18
55	0
56	0
57	24
58	44
59	64
60	94
61	100
62	94
63	64
64	44
65	24
66	0
67	0
68	32
69	60
70	96
71	130
72	160
73	160
74	130
75	96

[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 2, 0, 0, 4, 4, 4, 4, 4, 0, 0, 8, 8, 14, 14, 8, 8, 0, 0, 12, 18, 24, 36, 24, 18, 12, 0, 0, 18, 28, 44, 58, 58, 44, 28, 18, 0, 0, 24, 44, 64, 94, 100, 94, 64, 44, 24, 0, 0, 32, 60, 96, 130, 160, 160, 130, 96]

cp's OEIS Frontend

A272624 Array read by antidiagonals: T(n,k) = number of ways to choose 3 distinct points from an n X k rectangular grid so that they form an obtuse isosceles triangle of nonzero area.

Table of values

List of values

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	0
7	0
8	0
9	0
10	0
11	0
12	0
13	0
14	0
15	0
16	0
17	2
18	0
19	0
20	2
21	0
22	0
23	4
24	4
25	4
26	4
27	4
28	0
29	0
30	8
31	8
32	14
33	14
34	8
35	8
36	0
37	0
38	12
39	18
40	24
41	36
42	24
43	18
44	12
45	0
46	0
47	18
48	28
49	44
50	58
51	58
52	44
53	28
54	18
55	0
56	0
57	24
58	44
59	64
60	94
61	100
62	94
63	64
64	44
65	24
66	0
67	0
68	32
69	60
70	96
71	130
72	160
73	160
74	130
75	96

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	0
7	0
8	0
9	0
10	0
11	0
12	0
13	0
14	0
15	0
16	0
17	2
18	0
19	0
20	2
21	0
22	0
23	4
24	4
25	4
26	4
27	4
28	0
29	0
30	8
31	8
32	14
33	14
34	8
35	8
36	0
37	0
38	12
39	18
40	24
41	36
42	24
43	18
44	12
45	0
46	0
47	18
48	28
49	44
50	58
51	58
52	44
53	28
54	18
55	0
56	0
57	24
58	44
59	64
60	94
61	100
62	94
63	64
64	44
65	24
66	0
67	0
68	32
69	60
70	96
71	130
72	160
73	160
74	130
75	96

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	0
7	0
8	0
9	0
10	0
11	0
12	0
13	0
14	0
15	0
16	0
17	2
18	0
19	0
20	2
21	0
22	0
23	4
24	4
25	4
26	4
27	4
28	0
29	0
30	8
31	8
32	14
33	14
34	8
35	8
36	0
37	0
38	12
39	18
40	24
41	36
42	24
43	18
44	12
45	0
46	0
47	18
48	28
49	44
50	58
51	58
52	44
53	28
54	18
55	0
56	0
57	24
58	44
59	64
60	94
61	100
62	94
63	64
64	44
65	24
66	0
67	0
68	32
69	60
70	96
71	130
72	160
73	160
74	130
75	96