Number of degree-n odd permutations of order exactly 4.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =6a(5) =30a(6) =90a(7) =210a(8) =1680a(9) =12096a(10) =114660a(11) =833580a(12) =5928120a(13) =38112360a(14) =259194936a(15) =1739195640a(16) =17043237120a(17) =167089937280