A352866 - cp's OEIS frontend

A352866 Irregular table read by rows: T(n,k) is the number of regions formed after k diagonals, with k>=0, are drawn between vertices of a regular n-gon, with n>=3, when each vertex in turn is connected to the vertex two to its left, then three to its left, then four... until all vertices are connected by diagonals.

n	a(n)
3	1
4	1
5	2
6	4
7	1
8	2
9	4
10	6
11	8
12	11
13	1
14	2
15	4
16	6
17	8
18	10
19	13
20	16
21	20
22	24
23	1
24	2
25	4
26	6
27	8
28	10
29	12
30	15
31	18
32	22
33	27
34	32
35	37
36	43
37	50
38	1
39	2
40	4
41	6
42	8
43	10
44	12
45	14
46	17
47	20
48	24
49	29
50	34
51	39
52	44
53	50
54	57
55	62
56	68
57	74
58	80
59	1
60	2
61	4
62	6
63	8
64	10
65	12
66	14
67	16
68	19
69	22
70	26
71	31
72	36
73	41
74	46
75	51
76	57
77	64
78	71
79	79
80	88
81	98
82	108
83	118
84	129
85	141
86	154

[1, 1, 2, 4, 1, 2, 4, 6, 8, 11, 1, 2, 4, 6, 8, 10, 13, 16, 20, 24, 1, 2, 4, 6, 8, 10, 12, 15, 18, 22, 27, 32, 37, 43, 50, 1, 2, 4, 6, 8, 10, 12, 14, 17, 20, 24, 29, 34, 39, 44, 50, 57, 62, 68, 74, 80, 1, 2, 4, 6, 8, 10, 12, 14, 16, 19, 22, 26, 31, 36, 41, 46, 51, 57, 64, 71, 79, 88, 98, 108, 118, 129, 141, 154]

cp's OEIS Frontend

Table of values

List of values

n	a(n)
3	1
4	1
5	2
6	4
7	1
8	2
9	4
10	6
11	8
12	11
13	1
14	2
15	4
16	6
17	8
18	10
19	13
20	16
21	20
22	24
23	1
24	2
25	4
26	6
27	8
28	10
29	12
30	15
31	18
32	22
33	27
34	32
35	37
36	43
37	50
38	1
39	2
40	4
41	6
42	8
43	10
44	12
45	14
46	17
47	20
48	24
49	29
50	34
51	39
52	44
53	50
54	57
55	62
56	68
57	74
58	80
59	1
60	2
61	4
62	6
63	8
64	10
65	12
66	14
67	16
68	19
69	22
70	26
71	31
72	36
73	41
74	46
75	51
76	57
77	64
78	71
79	79
80	88
81	98
82	108
83	118
84	129
85	141
86	154

n	a(n)
3	1
4	1
5	2
6	4
7	1
8	2
9	4
10	6
11	8
12	11
13	1
14	2
15	4
16	6
17	8
18	10
19	13
20	16
21	20
22	24
23	1
24	2
25	4
26	6
27	8
28	10
29	12
30	15
31	18
32	22
33	27
34	32
35	37
36	43
37	50
38	1
39	2
40	4
41	6
42	8
43	10
44	12
45	14
46	17
47	20
48	24
49	29
50	34
51	39
52	44
53	50
54	57
55	62
56	68
57	74
58	80
59	1
60	2
61	4
62	6
63	8
64	10
65	12
66	14
67	16
68	19
69	22
70	26
71	31
72	36
73	41
74	46
75	51
76	57
77	64
78	71
79	79
80	88
81	98
82	108
83	118
84	129
85	141
86	154

n	a(n)
3	1
4	1
5	2
6	4
7	1
8	2
9	4
10	6
11	8
12	11
13	1
14	2
15	4
16	6
17	8
18	10
19	13
20	16
21	20
22	24
23	1
24	2
25	4
26	6
27	8
28	10
29	12
30	15
31	18
32	22
33	27
34	32
35	37
36	43
37	50
38	1
39	2
40	4
41	6
42	8
43	10
44	12
45	14
46	17
47	20
48	24
49	29
50	34
51	39
52	44
53	50
54	57
55	62
56	68
57	74
58	80
59	1
60	2
61	4
62	6
63	8
64	10
65	12
66	14
67	16
68	19
69	22
70	26
71	31
72	36
73	41
74	46
75	51
76	57
77	64
78	71
79	79
80	88
81	98
82	108
83	118
84	129
85	141
86	154