A113228 - cp's OEIS frontend

A113228 a(n) is the number of permutations of [1..n] that avoid the consecutive pattern 1324 (equally, the permutations that avoid 4231).

n	a(n)
0	1
1	1
2	2
3	6
4	23
5	110
6	632
7	4229
8	32337
9	278204
10	2659223
11	27959880
12	320706444
13	3985116699
14	53328433923
15	764610089967
16	11693644958690
17	190015358010114
18	3269272324528547
19	59373764638615449
20	1135048629795612125
21	22783668363316052016
22	479111084084119883217

[1, 1, 2, 6, 23, 110, 632, 4229, 32337, 278204, 2659223, 27959880, 320706444, 3985116699, 53328433923, 764610089967, 11693644958690, 190015358010114, 3269272324528547, 59373764638615449, 1135048629795612125, 22783668363316052016, 479111084084119883217]

cp's OEIS Frontend

A113228 a(n) is the number of permutations of [1..n] that avoid the consecutive pattern 1324 (equally, the permutations that avoid 4231).

Table of values

List of values