A107763 Number of ways to arrange the numbers (1,3,5,7,9,...,2n-1) in a circle such that every two adjacent numbers are relatively prime.

1, 1, 2, 6, 12, 72, 480, 864, 9600, 108000, 312000, 4795200, 46293120, 241056000, 4759413120, 94182359040, 478511953920, 4873965022080, 122634632171520, 799554193966080, 23063946114908160, 664424069072117760, 3198456730188840960, 108184656752428032000, 2657146152621477888000, 22850984107452933734400, 863305241854715928576000, 15282315334192501724774400, 151673086024479840160972800

Offset: 1

Author

Ray Chandler, Jun 11 2005

Keywords

• nonn

Comments

Odd analog of A086595.

Crossrefs

Cf. A076220, A086595, A102381, A107761, A107762.

Extensions

More terms from Max Alekseyev, Jun 11 2005

a(23)-a(29) from Max Alekseyev, Jul 08 2014