Number of even permutations of length n with no fixed points.

A003221

Number of even permutations of length n with no fixed points.

Terms

    a(0) =1a(1) =0a(2) =0a(3) =2a(4) =3a(5) =24a(6) =130a(7) =930a(8) =7413a(9) =66752a(10) =667476a(11) =7342290a(12) =88107415a(13) =1145396472a(14) =16035550518a(15) =240533257874

External references