A367118 - cp's OEIS frontend

A367118 Place n points in general position on each side of an equilateral triangle, and join every pair of the 3*n+3 boundary points by a chord; sequence gives number of regions in the resulting planar graph.

n	a(n)
0	1
1	13
2	82
3	307
4	841
5	1891
6	3718
7	6637
8	11017
9	17281
10	25906
11	37423
12	52417
13	71527
14	95446
15	124921
16	160753
17	203797
18	254962
19	315211
20	385561
21	467083
22	560902
23	668197
24	790201
25	928201
26	1083538
27	1257607
28	1451857
29	1667791
30	1906966
31	2170993
32	2461537
33	2780317
34	3129106
35	3509731
36	3924073
37	4374067

[1, 13, 82, 307, 841, 1891, 3718, 6637, 11017, 17281, 25906, 37423, 52417, 71527, 95446, 124921, 160753, 203797, 254962, 315211, 385561, 467083, 560902, 668197, 790201, 928201, 1083538, 1257607, 1451857, 1667791, 1906966, 2170993, 2461537, 2780317, 3129106, 3509731, 3924073, 4374067]

cp's OEIS Frontend

A367118 Place n points in general position on each side of an equilateral triangle, and join every pair of the 3*n+3 boundary points by a chord; sequence gives number of regions in the resulting planar graph.

Table of values

List of values