A075851 - cp's OEIS frontend

A075851 Number of permutations s of {1,2,...,n} such that |s(i)-i|>2 for each i=1,2,...,n.

n	a(n)
0	1
1	0
2	0
3	0
4	0
5	0
6	1
7	8
8	112
9	1168
10	13365
11	159414
12	2036488
13	27780408
14	404351752
15	6263006598
16	102946702825
17	1790795492176
18	32880327473840
19	635630231970048
20	12907624693811937
21	274744151265431700
22	6117666413618771968
23	142238172767973342656

[1, 0, 0, 0, 0, 0, 1, 8, 112, 1168, 13365, 159414, 2036488, 27780408, 404351752, 6263006598, 102946702825, 1790795492176, 32880327473840, 635630231970048, 12907624693811937, 274744151265431700, 6117666413618771968, 142238172767973342656]

cp's OEIS Frontend

A075851 Number of permutations s of {1,2,...,n} such that |s(i)-i|>2 for each i=1,2,...,n.

Table of values

List of values