A383462 - cp's OEIS frontend

A383462 Triangle read by rows: T(n,k) (n >= 3, 2 <= k <= n-1) = number of vertices where k lines cross in the planar graph formed when every pair of vertices of a regular n-gon are joined by an infinite line.

n	a(n)
3	3
4	1
5	4
6	10
7	0
8	5
9	30
10	1
11	0
12	6
13	84
14	0
15	0
16	0
17	7
18	120
19	16
20	1
21	0
22	0
23	8
24	324
25	0
26	0
27	0
28	0
29	0
30	9
31	420
32	40
33	0
34	1
35	0
36	0
37	0
38	10
39	880
40	0
41	0
42	0
43	0
44	0
45	0
46	0
47	11
48	708
49	156
50	24
51	0
52	1
53	0
54	0
55	0
56	0
57	12
58	1950
59	0
60	0
61	0
62	0
63	0
64	0
65	0
66	0
67	0
68	13
69	1890
70	280
71	0
72	0
73	0
74	1
75	0
76	0
77	0
78	0
79	0
80	14

[3, 1, 4, 10, 0, 5, 30, 1, 0, 6, 84, 0, 0, 0, 7, 120, 16, 1, 0, 0, 8, 324, 0, 0, 0, 0, 0, 9, 420, 40, 0, 1, 0, 0, 0, 10, 880, 0, 0, 0, 0, 0, 0, 0, 11, 708, 156, 24, 0, 1, 0, 0, 0, 0, 12, 1950, 0, 0, 0, 0, 0, 0, 0, 0, 0, 13, 1890, 280, 0, 0, 0, 1, 0, 0, 0, 0, 0, 14]

cp's OEIS Frontend

A383462 Triangle read by rows: T(n,k) (n >= 3, 2 <= k <= n-1) = number of vertices where k lines cross in the planar graph formed when every pair of vertices of a regular n-gon are joined by an infinite line.

Table of values

List of values