Number of permutations p of [n] such that the sequence of ascents and descents of 0p or of 0p0 (if n is odd) forms a Dyck path.
A303284
Number of permutations p of [n] such that the sequence of ascents and descents of 0p or of 0p0 (if n is odd) forms a Dyck path.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =4a(4) =8a(5) =60a(6) =172a(7) =1974a(8) =7296a(9) =114972a(10) =518324a(11) =10490392a(12) =55717312a(13) =1384890104a(14) =8460090160a(15) =250150900354
External references
- oeis: A303284