A092866 - cp's OEIS frontend

A092866 Number of intersections inside an equilateral triangular figure formed by the straight line segments mutually connecting all vertices and all points that divide the sides into n equal parts. If three or more lines meet at an interior point this intersection is counted only once.

n	a(n)
1	0
2	4
3	49
4	166
5	543
6	1237
7	2511
8	4762
9	7777
10	12262
11	18933
12	28504
13	39078
14	56065
15	73879
16	95962
17	124653
18	164761
19	203259
20	258646
21	311233
22	377932
23	458793
24	560755
25	648936
26	775258
27	908893
28	1056520
29	1215087
30	1428193
31	1607871
32	1866007
33	2111488
34	2399545
35	2694010
36	3040201
37	3356433
38	3811387
39	4253074
40	4720102
41	5180466
42	5806687
43	6324906
44	7035949
45	7690900
46	8392036
47	9180330
48	10136287
49	10894551
50	11930833

[0, 4, 49, 166, 543, 1237, 2511, 4762, 7777, 12262, 18933, 28504, 39078, 56065, 73879, 95962, 124653, 164761, 203259, 258646, 311233, 377932, 458793, 560755, 648936, 775258, 908893, 1056520, 1215087, 1428193, 1607871, 1866007, 2111488, 2399545, 2694010, 3040201, 3356433, 3811387, 4253074, 4720102, 5180466, 5806687, 6324906, 7035949, 7690900, 8392036, 9180330, 10136287, 10894551, 11930833]

cp's OEIS Frontend

A092866 Number of intersections inside an equilateral triangular figure formed by the straight line segments mutually connecting all vertices and all points that divide the sides into n equal parts. If three or more lines meet at an interior point this intersection is counted only once.

Table of values

List of values