Number of aperiodic permutations of {1..n}.

Terms

a(0) =1a(1) =0a(2) =3a(3) =16a(4) =115a(5) =660a(6) =5033a(7) =39936a(8) =362718a(9) =3624920a(10) =39916789a(11) =478953648a(12) =6227020787a(13) =87177645996