A117106 - cp's OEIS frontend

A117106 Number of permutations in S_n avoiding 21{bar 3}54 (i.e., every occurrence of 2154 is contained in an occurrence of a 21354).

n	a(n)
0	1
1	1
2	2
3	6
4	23
5	104
6	530
7	2958
8	17734
9	112657
10	750726
11	5207910
12	37387881
13	276467208
14	2097763554
15	16282567502
16	128951419810
17	1039752642231
18	8520041699078
19	70840843420234
20	596860116487097
21	5089815866230374
22	43886435477701502
23	382269003235832006
24	3361054683237796748

[1, 1, 2, 6, 23, 104, 530, 2958, 17734, 112657, 750726, 5207910, 37387881, 276467208, 2097763554, 16282567502, 128951419810, 1039752642231, 8520041699078, 70840843420234, 596860116487097, 5089815866230374, 43886435477701502, 382269003235832006, 3361054683237796748]

cp's OEIS Frontend

A117106 Number of permutations in S_n avoiding 21{bar 3}54 (i.e., every occurrence of 2154 is contained in an occurrence of a 21354).

Table of values

List of values