A324132 - cp's OEIS frontend

A324132 Number of permutations of [n] that avoid the shuffle pattern s-k-t, where s = 1 and t = 1234.

n	a(n)
0	1
1	1
2	2
3	6
4	24
5	120
6	715
7	4946
8	38963
9	344350
10	3374300
11	36309360
12	425630742
13	5398849407
14	73675463140
15	1076309968529
16	16759420085633
17	277094358530356
18	4848092369455556
19	89489787445905318
20	1738016295746132796
21	35427829798218756153
22	756269443056959088424
23	16871986369868627423375

[1, 1, 2, 6, 24, 120, 715, 4946, 38963, 344350, 3374300, 36309360, 425630742, 5398849407, 73675463140, 1076309968529, 16759420085633, 277094358530356, 4848092369455556, 89489787445905318, 1738016295746132796, 35427829798218756153, 756269443056959088424, 16871986369868627423375]

cp's OEIS Frontend

A324132 Number of permutations of [n] that avoid the shuffle pattern s-k-t, where s = 1 and t = 1234.

Table of values

List of values