Number of permutations of [n] with no carrier element, that is, having their exterior (longest pattern that is both a proper prefix and a proper suffix) contained in their interior (permutation obtained by deleting the first and the last entry) as a consecutive pattern.
A263866
Number of permutations of [n] with no carrier element, that is, having their exterior (longest pattern that is both a proper prefix and a proper suffix) contained in their interior (permutation obtained by deleting the first and the last entry) as a consecutive pattern.
Terms
- a(0) =0a(1) =4a(2) =12a(3) =84a(4) =548a(5) =4172a(6) =33984a(7) =315800a(8) =3213032
External references
- oeis: A263866