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.

%I A107762 #8 Jul 11 2015 10:24:41
%S A107762 1,2,6,24,60,432,3360,6912,86400,1080000,3432000,57542400,601810560,
%T A107762 3374784000,71391196800,1506917744640,8134703216640,87731370397440,
%U A107762 2330058011258880,15991083879321600,484342868413071360
%N 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.
%C A107762 Odd analog of A102381. Equals n*A107763(n).
%Y A107762 Cf. A076220, A086595, A102381, A107761, A107763.
%K A107762 nonn
%O A107762 1,2
%A A107762 _Ray Chandler_, Jun 11 2005
%E A107762 More terms from _Max Alekseyev_, Jun 11 2005

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.