Number of discordant permutations of length n.

Terms

a(0) =0a(1) =0a(2) =0a(3) =1a(4) =2a(5) =20a(6) =144a(7) =1265a(8) =12072a(9) =126565a(10) =1445100a(11) =17875140a(12) =238282730a(13) =3407118041a(14) =52034548064a(15) =845569542593