A324136 - cp's OEIS frontend

A324136 Number of permutations of [n] that avoid the shuffle pattern s-k-t, where s = 12 and t = 1234.

n	a(n)
0	1
1	1
2	2
3	6
4	24
5	120
6	720
7	5025
8	39926
9	355538
10	3505864
11	37917861
12	446320694
13	5680229144
14	77727692650
15	1138088663183
16	17755248475106
17	294036917039062
18	5151744388600780
19	95211200654845109
20	1851125559811374946
21	37769517149637845508
22	806945623696758245062

[1, 1, 2, 6, 24, 120, 720, 5025, 39926, 355538, 3505864, 37917861, 446320694, 5680229144, 77727692650, 1138088663183, 17755248475106, 294036917039062, 5151744388600780, 95211200654845109, 1851125559811374946, 37769517149637845508, 806945623696758245062]

cp's OEIS Frontend

A324136 Number of permutations of [n] that avoid the shuffle pattern s-k-t, where s = 12 and t = 1234.

Table of values

List of values