Number of (S_5 67)-avoiding permutations.

Terms

a(0) =1a(1) =2a(2) =6a(3) =24a(4) =120a(5) =720a(6) =5040a(7) =40320a(8) =357840a(9) =3427200a(10) =34685280a(11) =365541120a(12) =3971615760a(13) =44181889920a(14) =500788985760