Number of permutations of 1..n with no five elements in correct or reverse order.
A095818
Number of permutations of 1..n with no five elements in correct or reverse order.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =24a(5) =118a(6) =714a(7) =5012a(8) =40164a(9) =361872a(10) =3621366a(11) =39854930a(12) =478427452a(13) =6221137644a(14) =87112280208
External references
- oeis: A095818