Number of permutations of 1..n with no three elements in correct or reverse order.
A095816
Number of permutations of 1..n with no three elements in correct or reverse order.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =18a(5) =92a(6) =570a(7) =4082a(8) =33292a(9) =304490a(10) =3086890a(11) =34357812a(12) =416526730a(13) =5463479106a(14) =77094352076
External references
- oeis: A095816