A279679 - cp's OEIS frontend

A279679 Irregular triangle read by rows: possible numbers of diagonals of an n-edged convex polyhedron.

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

[0, 0, 0, 1, 0, 1, 1, 2, 0, 2, 3, 4, 2, 3, 4, 5, 0, 3, 4, 5, 6, 7, 3, 4, 5, 6, 7, 8, 9, 10, 0, 4, 6, 7, 8, 9, 10, 11, 12, 13, 4, 5, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 0, 5, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20]

cp's OEIS Frontend

A279679 Irregular triangle read by rows: possible numbers of diagonals of an n-edged convex polyhedron.

Table of values

List of values

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

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

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