A320526 - cp's OEIS frontend

A320526 a(n) is the number of chiral pairs of color patterns (set partitions) in a row of length n using exactly 3 colors (subsets).

n	a(n)
1	0
2	0
3	0
4	2
5	10
6	40
7	141
8	464
9	1480
10	4600
11	14145
12	43052
13	130480
14	393820
15	1186521
16	3568784
17	10725760
18	32213200
19	96714465
20	290284052
21	871142800
22	2613981700
23	7843080201
24	23531425304
25	70598731840
26	211804847800
27	635432109585
28	1906330676252
29	5719061512720
30	17157321139180

[0, 0, 0, 2, 10, 40, 141, 464, 1480, 4600, 14145, 43052, 130480, 393820, 1186521, 3568784, 10725760, 32213200, 96714465, 290284052, 871142800, 2613981700, 7843080201, 23531425304, 70598731840, 211804847800, 635432109585, 1906330676252, 5719061512720, 17157321139180]

cp's OEIS Frontend

A320526 a(n) is the number of chiral pairs of color patterns (set partitions) in a row of length n using exactly 3 colors (subsets).

Table of values

List of values