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.

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

Offset: 1

Author

Ray Chandler, Jun 11 2005

Keywords

• nonn

Comments

Odd analog of A102381. Equals n*A107763(n).

Crossrefs

Cf. A076220, A086595, A102381, A107761, A107763.

Extensions

More terms from Max Alekseyev, Jun 11 2005