Number of permutations of [2n+1] beginning with exactly n ascents.
A262035
Number of permutations of [2n+1] beginning with exactly n ascents.
Terms
- a(0) =1a(1) =2a(2) =15a(3) =168a(4) =2520a(5) =47520a(6) =1081080a(7) =28828800a(8) =882161280a(9) =30474662400
External references
- oeis: A262035