A111277 - cp's OEIS frontend

A111277 Number of permutations avoiding the patterns {2413,4213,2431,4231,4321}; also number of permutations avoiding the patterns {3142,3412,3421,4312,4321}; number of weak sorting class based on 2413 or 3142.

n	a(n)
0	1
1	1
2	2
3	6
4	19
5	59
6	180
7	544
8	1637
9	4917
10	14758
11	44282
12	132855
13	398575
14	1195736
15	3587220
16	10761673
17	32285033
18	96855114
19	290565358
20	871696091
21	2615088291
22	7845264892
23	23535794696
24	70607384109
25	211822152349
26	635466457070

[1, 1, 2, 6, 19, 59, 180, 544, 1637, 4917, 14758, 44282, 132855, 398575, 1195736, 3587220, 10761673, 32285033, 96855114, 290565358, 871696091, 2615088291, 7845264892, 23535794696, 70607384109, 211822152349, 635466457070]

cp's OEIS Frontend

A111277 Number of permutations avoiding the patterns {2413,4213,2431,4231,4321}; also number of permutations avoiding the patterns {3142,3412,3421,4312,4321}; number of weak sorting class based on 2413 or 3142.

Table of values

List of values