A136127 - cp's OEIS frontend

A136127 Number of permutations of {1,2,...,n} having excedance set {1,2,...,k} for some k=0...n-1 (for k=0 we have the empty set). The excedance set of a permutation p in S_n is the set of indices i such that p(i)>i.

n	a(n)
0	1
1	1
2	2
3	5
4	16
5	63
6	294
7	1585
8	9692
9	66275
10	501106
11	4150965
12	37383528
13	363674407
14	3800501438
15	42460229945
16	505029329524
17	6371454458859
18	84981113118090
19	1194793819467325
20	17660505018471680
21	273788611235722031
22	4442085091233531862
23	75276072393821203905

[1, 1, 2, 5, 16, 63, 294, 1585, 9692, 66275, 501106, 4150965, 37383528, 363674407, 3800501438, 42460229945, 505029329524, 6371454458859, 84981113118090, 1194793819467325, 17660505018471680, 273788611235722031, 4442085091233531862, 75276072393821203905]

cp's OEIS Frontend

A136127 Number of permutations of {1,2,...,n} having excedance set {1,2,...,k} for some k=0...n-1 (for k=0 we have the empty set). The excedance set of a permutation p in S_n is the set of indices i such that p(i)>i.

Table of values

List of values