A005656 - cp's OEIS frontend

A005656 Number of bracelets (turn over necklaces) with n red, 1 pink and n - 3 blue beads; also reversible strings with n red and n-3 blue beads.

n	a(n)
1	0
2	0
3	1
4	3
5	12
6	44
7	170
8	651
9	2520
10	9752
11	37854
12	147070
13	572264
14	2229096
15	8692788
16	33933459
17	132594480
18	518584880
19	2029976630
20	7952706234
21	31179618184
22	122331419080
23	480283635468
24	1886828198398

[0, 0, 1, 3, 12, 44, 170, 651, 2520, 9752, 37854, 147070, 572264, 2229096, 8692788, 33933459, 132594480, 518584880, 2029976630, 7952706234, 31179618184, 122331419080, 480283635468, 1886828198398]

cp's OEIS Frontend

A005656 Number of bracelets (turn over necklaces) with n red, 1 pink and n - 3 blue beads; also reversible strings with n red and n-3 blue beads.

Table of values

List of values