A366479 - cp's OEIS frontend

A366479 Irregular triangle T(n,k) (n >= 0, k >= 2) read by rows. Consider the planar graph formed from an equilateral triangle with n equally spaced points placed on each edge, as discussed in A092867(n+1). Then T(n,k) is the number of interior points where exactly k chords cross.

n	a(n)
0	0
1	3
2	1
3	42
4	7
5	123
6	37
7	6
8	444
9	90
10	6
11	3
12	1053
13	138
14	33
15	12
16	1
17	2145
18	285
19	63
20	15
21	0
22	3
23	4173
24	481
25	72
26	24
27	12
28	6774
29	790
30	165
31	30
32	9
33	3
34	6
35	10698
36	1270
37	183
38	75
39	24
40	6
41	6
42	16827
43	1584
44	393
45	102
46	6
47	12
48	6
49	3
50	25746
51	2220
52	339
53	135
54	40
55	12
56	6
57	6
58	35052
59	3084
60	684
61	177
62	42
63	18
64	6
65	9
66	6

[0, 3, 1, 42, 7, 123, 37, 6, 444, 90, 6, 3, 1053, 138, 33, 12, 1, 2145, 285, 63, 15, 0, 3, 4173, 481, 72, 24, 12, 6774, 790, 165, 30, 9, 3, 6, 10698, 1270, 183, 75, 24, 6, 6, 16827, 1584, 393, 102, 6, 12, 6, 3, 25746, 2220, 339, 135, 40, 12, 6, 6, 35052, 3084, 684, 177, 42, 18, 6, 9, 6]

cp's OEIS Frontend

A366479 Irregular triangle T(n,k) (n >= 0, k >= 2) read by rows. Consider the planar graph formed from an equilateral triangle with n equally spaced points placed on each edge, as discussed in A092867(n+1). Then T(n,k) is the number of interior points where exactly k chords cross.

Table of values

List of values