A366486 - cp's OEIS frontend

A366486 Place n equally spaced points on each side of an equilateral triangle, and join each of these points by a chord to the 2*n new points on the other two sides: sequence gives number of regions in the resulting planar graph.

n	a(n)
0	1
1	4
2	27
3	130
4	385
5	1044
6	2005
7	4060
8	6831
9	11272
10	16819
11	26436
12	35737
13	52147
14	69984
15	92080
16	117952
17	157770
18	193465
19	249219
20	302670
21	368506
22	443026
23	546462
24	635125
25	757978
26	890133
27	1041775
28	1191442
29	1407324
30	1581058
31	1837417
32	2085096
33	2365657
34	2670429
35	3018822
36	3328351
37	3771595
38	4213602

[1, 4, 27, 130, 385, 1044, 2005, 4060, 6831, 11272, 16819, 26436, 35737, 52147, 69984, 92080, 117952, 157770, 193465, 249219, 302670, 368506, 443026, 546462, 635125, 757978, 890133, 1041775, 1191442, 1407324, 1581058, 1837417, 2085096, 2365657, 2670429, 3018822, 3328351, 3771595, 4213602]

cp's OEIS Frontend

A366486 Place n equally spaced points on each side of an equilateral triangle, and join each of these points by a chord to the 2*n new points on the other two sides: sequence gives number of regions in the resulting planar graph.

Table of values

List of values