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

Terms

a(0) =0a(1) =0a(2) =1a(3) =3a(4) =12a(5) =40a(6) =120a(7) =336a(8) =2128a(9) =13392a(10) =118800a(11) =850960a(12) =6004416a(13) =38408448a(14) =260321152a(15) =1744135680a(16) =17067141120a(17) =167200393216