Number of permutations p of [2n] such that the sequence of ascents and descents of p0 forms a Dyck path.
A303285
Number of permutations p of [2n] such that the sequence of ascents and descents of p0 forms a Dyck path.
Terms
- a(0) =1a(1) =1a(2) =8a(3) =172a(4) =7296a(5) =518324a(6) =55717312a(7) =8460090160
External references
- oeis: A303285