A333642 - cp's OEIS frontend

A333642 Number of regions in a polygon whose boundary consists of n+2 equally spaced points around a semicircle and three equally spaced points along the diameter (a total of n+3 points). See Comments for precise definition.

n	a(n)
1	2
2	8
3	20
4	43
5	80
6	139
7	224
8	324
9	510
10	730
11	992
12	1373
13	1820
14	2187
15	3040
16	3844
17	4720
18	5916
19	7220
20	8498
21	10472
22	12463
23	14570
24	17278
25	20150
26	23130
27	26964
28	30961
29	34688
30	40265
31	45632
32	51138
33	57970
34	65008
35	72322
36	80979
37	89984
38	99197
39	110240
40	121570
41	132896
42	146818

[2, 8, 20, 43, 80, 139, 224, 324, 510, 730, 992, 1373, 1820, 2187, 3040, 3844, 4720, 5916, 7220, 8498, 10472, 12463, 14570, 17278, 20150, 23130, 26964, 30961, 34688, 40265, 45632, 51138, 57970, 65008, 72322, 80979, 89984, 99197, 110240, 121570, 132896, 146818]

cp's OEIS Frontend

A333642 Number of regions in a polygon whose boundary consists of n+2 equally spaced points around a semicircle and three equally spaced points along the diameter (a total of n+3 points). See Comments for precise definition.

Table of values

List of values