A137538 - cp's OEIS frontend

A137538 Number of permutations in S_n avoiding 25{bar 1}34 (i.e., every occurrence of 2534 is contained in an occurrence of a 25134).

n	a(n)
0	1
1	1
2	2
3	6
4	23
5	104
6	532
7	3004
8	18426
9	121393
10	851810
11	6325151
12	49448313
13	405298482
14	3470885747
15	30965656442
16	287083987270
17	2759838731485
18	27458514900626
19	282264050120512
20	2993392570828096
21	32704759586810036
22	367673428857985261

[1, 1, 2, 6, 23, 104, 532, 3004, 18426, 121393, 851810, 6325151, 49448313, 405298482, 3470885747, 30965656442, 287083987270, 2759838731485, 27458514900626, 282264050120512, 2993392570828096, 32704759586810036, 367673428857985261]

cp's OEIS Frontend

A137538 Number of permutations in S_n avoiding 25{bar 1}34 (i.e., every occurrence of 2534 is contained in an occurrence of a 25134).

Table of values

List of values