A005654 - cp's OEIS frontend

A005654 Number of bracelets (turn over necklaces) with n red, 1 pink and n-1 blue beads; also reversible strings with n red and n-1 blue beads; also next-to-central column in Losanitsch's triangle A034851.

n	a(n)
1	1
2	2
3	6
4	19
5	66
6	236
7	868
8	3235
9	12190
10	46252
11	176484
12	676270
13	2600612
14	10030008
15	38781096
16	150273315
17	583407990
18	2268795980
19	8836340260
20	34461678394
21	134564560988
22	526024917288
23	2058358034616
24	8061901596814
25	31602652961516
26	123979635837176
27	486734861612328

[1, 2, 6, 19, 66, 236, 868, 3235, 12190, 46252, 176484, 676270, 2600612, 10030008, 38781096, 150273315, 583407990, 2268795980, 8836340260, 34461678394, 134564560988, 526024917288, 2058358034616, 8061901596814, 31602652961516, 123979635837176, 486734861612328]

cp's OEIS Frontend

A005654 Number of bracelets (turn over necklaces) with n red, 1 pink and n-1 blue beads; also reversible strings with n red and n-1 blue beads; also next-to-central column in Losanitsch's triangle A034851.

Table of values

List of values