A212432 - cp's OEIS frontend

A212432 Number of equivalence classes of S_n under transformations of positionally and numerically adjacent elements of the form abc <--> acb <--> cba where a

n	a(n)
0	1
1	1
2	2
3	4
4	16
5	84
6	536
7	3912
8	32256
9	297072
10	3026112
11	33798720
12	410826624
13	5399704320
14	76317546240
15	1154312486400
16	18604815528960
17	318348065548800
18	5763746405053440
19	110086912964367360
20	2212209395234979840
21	46657233031296706560
22	1030510550216174469120

[1, 1, 2, 4, 16, 84, 536, 3912, 32256, 297072, 3026112, 33798720, 410826624, 5399704320, 76317546240, 1154312486400, 18604815528960, 318348065548800, 5763746405053440, 110086912964367360, 2212209395234979840, 46657233031296706560, 1030510550216174469120]

cp's OEIS Frontend

A212432 Number of equivalence classes of S_n under transformations of positionally and numerically adjacent elements of the form abc <--> acb <--> cba where a

Table of values

List of values