A212581 - cp's OEIS frontend

A212581 Number of equivalence classes of S_n under transformations of positionally and numerically adjacent elements of the form abc <--> acb <--> bac where a

n	a(n)
0	1
1	1
2	2
3	4
4	17
5	89
6	556
7	4011
8	32843
9	301210
10	3059625
11	34104275
12	413919214
13	5434093341
14	76734218273
15	1159776006262
16	18681894258591
17	319512224705645
18	5782488507020050
19	110407313135273127
20	2218005876646727423
21	46767874983437110354
22	1032732727339665789981

[1, 1, 2, 4, 17, 89, 556, 4011, 32843, 301210, 3059625, 34104275, 413919214, 5434093341, 76734218273, 1159776006262, 18681894258591, 319512224705645, 5782488507020050, 110407313135273127, 2218005876646727423, 46767874983437110354, 1032732727339665789981]

cp's OEIS Frontend

A212581 Number of equivalence classes of S_n under transformations of positionally and numerically adjacent elements of the form abc <--> acb <--> bac where a

Table of values

List of values