A006932 - cp's OEIS frontend

A006932 Number of permutations of [n] with at least one strong fixed point (a permutation p of {1,2,...,n} is said to have j as a strong fixed point if p(k) < j for k < j and p(k) > j for k > j).

n	a(n)
1	1
2	1
3	3
4	10
5	43
6	223
7	1364
8	9643
9	77545
10	699954
11	7013079
12	77261803
13	928420028
14	12085410927
15	169413357149
16	2544367949634
17	40758600588283
18	693684669653911
19	12499734669634036
20	237734433597317987
21	4759174459355303521

[1, 1, 3, 10, 43, 223, 1364, 9643, 77545, 699954, 7013079, 77261803, 928420028, 12085410927, 169413357149, 2544367949634, 40758600588283, 693684669653911, 12499734669634036, 237734433597317987, 4759174459355303521]

cp's OEIS Frontend

A006932 Number of permutations of [n] with at least one strong fixed point (a permutation p of {1,2,...,n} is said to have j as a strong fixed point if p(k) < j for k < j and p(k) > j for k > j).

Table of values

List of values