A177265 - cp's OEIS frontend

A177265 Number of permutations of {1,2,...,n} having exactly one string of consecutive fixed points (including singletons).

n	a(n)
1	1
2	1
3	4
4	12
5	57
6	321
7	2176
8	17008
9	150505
10	1485465
11	16170036
12	192384876
13	2483177809
14	34554278857
15	515620794592
16	8212685046336
17	139062777326001
18	2494364438359953
19	47245095998005060
20	942259727190907180
21	19737566982241851721
22	433234326593362631601

[1, 1, 4, 12, 57, 321, 2176, 17008, 150505, 1485465, 16170036, 192384876, 2483177809, 34554278857, 515620794592, 8212685046336, 139062777326001, 2494364438359953, 47245095998005060, 942259727190907180, 19737566982241851721, 433234326593362631601]

cp's OEIS Frontend

A177265 Number of permutations of {1,2,...,n} having exactly one string of consecutive fixed points (including singletons).

Table of values

List of values