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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.
2
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
1,3
COMMENTS
Odd analog of A086595.
CROSSREFS
KEYWORD
nonn
AUTHOR
Ray Chandler, Jun 11 2005
EXTENSIONS
More terms from Max Alekseyev, Jun 11 2005
a(23)-a(29) from Max Alekseyev, Jul 08 2014
STATUS
approved