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

A051695

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

Terms

    a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =90a(6) =630a(7) =3780a(8) =18900a(9) =94500a(10) =457380a(11) =3825360a(12) =31505760a(13) =312432120a(14) =2704501800a(15) =22984481520a(16) =179863997040

External references