Number of permutations p of [2n+1] such that 0p has exactly n+1 alternating runs.
A303159
Number of permutations p of [2n+1] such that 0p has exactly n+1 alternating runs.
Terms
- a(0) =1a(1) =3a(2) =43a(3) =1344a(4) =74211a(5) =6384708a(6) =789649750a(7) =132789007200
External references
- oeis: A303159