A280639 - cp's OEIS frontend

A280639 Triangle read by rows: T(n,k), n>=k>=1, is the number of obtuse isosceles triangles with integral coordinates that have a bounding box of size n X k.

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	0
7	0
8	0
9	0
10	4
11	0
12	2
13	0
14	0
15	4
16	0
17	0
18	0
19	0
20	0
21	8
22	0
23	2
24	2
25	0
26	0
27	0
28	8
29	0
30	0
31	0
32	0
33	0
34	0
35	0
36	12
37	0
38	2
39	2
40	2
41	4
42	0
43	0
44	0
45	12
46	0
47	0
48	0
49	4
50	0
51	0
52	0
53	0
54	0
55	16
56	0
57	2
58	2
59	2
60	2
61	0
62	0
63	0
64	0
65	0
66	16
67	0
68	0
69	0
70	0
71	0
72	0
73	0
74	0
75	0
76	0
77	0
78	20
79	0
80	2
81	2
82	2
83	2
84	6
85	4

[0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 2, 0, 0, 4, 0, 0, 0, 0, 0, 8, 0, 2, 2, 0, 0, 0, 8, 0, 0, 0, 0, 0, 0, 0, 12, 0, 2, 2, 2, 4, 0, 0, 0, 12, 0, 0, 0, 4, 0, 0, 0, 0, 0, 16, 0, 2, 2, 2, 2, 0, 0, 0, 0, 0, 16, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 20, 0, 2, 2, 2, 2, 6, 4]

cp's OEIS Frontend

A280639 Triangle read by rows: T(n,k), n>=k>=1, is the number of obtuse isosceles triangles with integral coordinates that have a bounding box of size n X k.

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	4
11	0
12	2
13	0
14	0
15	4
16	0
17	0
18	0
19	0
20	0
21	8
22	0
23	2
24	2
25	0
26	0
27	0
28	8
29	0
30	0
31	0
32	0
33	0
34	0
35	0
36	12
37	0
38	2
39	2
40	2
41	4
42	0
43	0
44	0
45	12
46	0
47	0
48	0
49	4
50	0
51	0
52	0
53	0
54	0
55	16
56	0
57	2
58	2
59	2
60	2
61	0
62	0
63	0
64	0
65	0
66	16
67	0
68	0
69	0
70	0
71	0
72	0
73	0
74	0
75	0
76	0
77	0
78	20
79	0
80	2
81	2
82	2
83	2
84	6
85	4

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	0
7	0
8	0
9	0
10	4
11	0
12	2
13	0
14	0
15	4
16	0
17	0
18	0
19	0
20	0
21	8
22	0
23	2
24	2
25	0
26	0
27	0
28	8
29	0
30	0
31	0
32	0
33	0
34	0
35	0
36	12
37	0
38	2
39	2
40	2
41	4
42	0
43	0
44	0
45	12
46	0
47	0
48	0
49	4
50	0
51	0
52	0
53	0
54	0
55	16
56	0
57	2
58	2
59	2
60	2
61	0
62	0
63	0
64	0
65	0
66	16
67	0
68	0
69	0
70	0
71	0
72	0
73	0
74	0
75	0
76	0
77	0
78	20
79	0
80	2
81	2
82	2
83	2
84	6
85	4

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	0
7	0
8	0
9	0
10	4
11	0
12	2
13	0
14	0
15	4
16	0
17	0
18	0
19	0
20	0
21	8
22	0
23	2
24	2
25	0
26	0
27	0
28	8
29	0
30	0
31	0
32	0
33	0
34	0
35	0
36	12
37	0
38	2
39	2
40	2
41	4
42	0
43	0
44	0
45	12
46	0
47	0
48	0
49	4
50	0
51	0
52	0
53	0
54	0
55	16
56	0
57	2
58	2
59	2
60	2
61	0
62	0
63	0
64	0
65	0
66	16
67	0
68	0
69	0
70	0
71	0
72	0
73	0
74	0
75	0
76	0
77	0
78	20
79	0
80	2
81	2
82	2
83	2
84	6
85	4