A370979 - cp's OEIS frontend

A370979 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 edges in H_n.

n	a(n)
1	1
2	4
3	21
4	20
5	135
6	144
7	553
8	440
9	1575
10	1460
11	3729
12	3132
13	7527
14	6888
15	13605
16	12016
17	23307
18	20988
19	36385
20	32420
21	54915
22	51216
23	79741
24	70776
25	113175
26	105300
27	154845
28	144508
29	206799
30	195840
31	272893
32	255840
33	352275
34	335036
35	446845
36	422820
37	561031
38	534736
39	695877
40	659480
41	850463
42	815724

[1, 4, 21, 20, 135, 144, 553, 440, 1575, 1460, 3729, 3132, 7527, 6888, 13605, 12016, 23307, 20988, 36385, 32420, 54915, 51216, 79741, 70776, 113175, 105300, 154845, 144508, 206799, 195840, 272893, 255840, 352275, 335036, 446845, 422820, 561031, 534736, 695877, 659480, 850463, 815724]

cp's OEIS Frontend

A370979 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 edges in H_n.

Table of values

List of values