Number of reducible permutations.

Terms

a(0) =0a(1) =0a(2) =1a(3) =3a(4) =11a(5) =49a(6) =259a(7) =1593a(8) =11227a(9) =89537a(10) =799475a(11) =7917897a(12) =86257643a(13) =1025959345a(14) =13234866787a(15) =184078090137