A107762 - cp's OEIS frontend

A107762 Number of permutations of (1,3,5,7,9,...,2n-1) in which every pair of adjacent numbers as well as the first and the last entries are relatively prime.

n	a(n)
1	1
2	2
3	6
4	24
5	60
6	432
7	3360
8	6912
9	86400
10	1080000
11	3432000
12	57542400
13	601810560
14	3374784000
15	71391196800
16	1506917744640
17	8134703216640
18	87731370397440
19	2330058011258880
20	15991083879321600
21	484342868413071360

[1, 2, 6, 24, 60, 432, 3360, 6912, 86400, 1080000, 3432000, 57542400, 601810560, 3374784000, 71391196800, 1506917744640, 8134703216640, 87731370397440, 2330058011258880, 15991083879321600, 484342868413071360]

cp's OEIS Frontend

A107762 Number of permutations of (1,3,5,7,9,...,2n-1) in which every pair of adjacent numbers as well as the first and the last entries are relatively prime.

Table of values

List of values