A212580 - cp's OEIS frontend

A212580 Number of equivalence classes of S_n under transformations of positionally and numerically adjacent elements of the form abc <--> acb where a

n	a(n)
0	1
1	1
2	2
3	5
4	20
5	102
6	626
7	4458
8	36144
9	328794
10	3316944
11	36755520
12	443828184
13	5800823880
14	81591320880
15	1228888215960
16	19733475278880
17	336551479543440
18	6075437671458000
19	115733952138747600
20	2320138519554562560
21	48827468196234035280
22	1076310620915575933440

[1, 1, 2, 5, 20, 102, 626, 4458, 36144, 328794, 3316944, 36755520, 443828184, 5800823880, 81591320880, 1228888215960, 19733475278880, 336551479543440, 6075437671458000, 115733952138747600, 2320138519554562560, 48827468196234035280, 1076310620915575933440]

cp's OEIS Frontend

A212580 Number of equivalence classes of S_n under transformations of positionally and numerically adjacent elements of the form abc <--> acb where a

Table of values

List of values