Number of permutations p of [n] such that 0p has exactly ceiling(n/2) alternating runs.
A303160
Number of permutations p of [n] such that 0p has exactly ceiling(n/2) alternating runs.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =3a(4) =7a(5) =43a(6) =148a(7) =1344a(8) =6171a(9) =74211a(10) =425976a(11) =6384708a(12) =43979902a(13) =789649750a(14) =6346283560a(15) =132789007200
External references
- oeis: A303160