A370978 - cp's OEIS frontend

A370978 Draw a regular n-gon and the enclosing circle, then for each pair of vertices X, Y, draw a circle with diameter XY; the union of these figures is the graph H_n; sequence gives number of regions in H_n.

n	a(n)
1	1
2	3
3	16
4	16
5	81
6	91
7	302
8	272
9	829
10	831
11	1926
12	1752
13	3849
14	3739
15	6916
16	6464
17	11799
18	11143
19	18374
20	17180
21	27679
22	26819
23	40136
24	37200
25	56901
26	54679
27	77788
28	74816
29	103821
30	101071
31	136928
32	131776
33	176683
34	172143
35	224036
36	216936
37	281201
38	273867
39	348700
40	337520
41	426073
42	416683

[1, 3, 16, 16, 81, 91, 302, 272, 829, 831, 1926, 1752, 3849, 3739, 6916, 6464, 11799, 11143, 18374, 17180, 27679, 26819, 40136, 37200, 56901, 54679, 77788, 74816, 103821, 101071, 136928, 131776, 176683, 172143, 224036, 216936, 281201, 273867, 348700, 337520, 426073, 416683]

cp's OEIS Frontend

A370978 Draw a regular n-gon and the enclosing circle, then for each pair of vertices X, Y, draw a circle with diameter XY; the union of these figures is the graph H_n; sequence gives number of regions in H_n.

Table of values

List of values