A214308 - cp's OEIS frontend

A214308 a(n) is the number of all two colored bracelets (necklaces with turning over allowed) with n beads with the two colors from a repertoire of n distinct colors, for n>=2.

n	a(n)
2	1
3	6
4	24
5	60
6	165
7	336
8	784
9	1584
10	3420
11	6820
12	14652
13	29484
14	62335
15	128310
16	269760
17	558960
18	1175499
19	2446668
20	5131900
21	10702020
22	22385517
23	46655224
24	97344096
25	202555800
26	421478200
27	875297124
28	1816696728
29	3764747868
30	7795573230
31	16121364000
32	33310887808

[1, 6, 24, 60, 165, 336, 784, 1584, 3420, 6820, 14652, 29484, 62335, 128310, 269760, 558960, 1175499, 2446668, 5131900, 10702020, 22385517, 46655224, 97344096, 202555800, 421478200, 875297124, 1816696728, 3764747868, 7795573230, 16121364000, 33310887808]

cp's OEIS Frontend

A214308 a(n) is the number of all two colored bracelets (necklaces with turning over allowed) with n beads with the two colors from a repertoire of n distinct colors, for n>=2.

Table of values

List of values