A352144 - cp's OEIS frontend

A352144 The number of interior points that are intersections of exactly two chords for a 2n-gon where all its vertices are joined by lines (cf. A006561).

n	a(n)
1	0
2	1
3	12
4	40
5	140
6	228
7	644
8	1168
9	1512
10	3360
11	5280
12	6144
13	11284
14	15680
15	13800
16	28448
17	37264
18	42444
19	60648
20	75720
21	75012
22	114400
23	138644
24	152064
25	198200
26	234208
27	254988
28	321048
29	372708
30	375060
31	494140
32	564800
33	605352
34	728960
35	823480
36	894816
37	1039404
38	1161888
39	1241760
40	1439440
41	1595720

[0, 1, 12, 40, 140, 228, 644, 1168, 1512, 3360, 5280, 6144, 11284, 15680, 13800, 28448, 37264, 42444, 60648, 75720, 75012, 114400, 138644, 152064, 198200, 234208, 254988, 321048, 372708, 375060, 494140, 564800, 605352, 728960, 823480, 894816, 1039404, 1161888, 1241760, 1439440, 1595720]

cp's OEIS Frontend

A352144 The number of interior points that are intersections of exactly two chords for a 2n-gon where all its vertices are joined by lines (cf. A006561).

Table of values

List of values