Number of permutations p() of 1..n+7 with centered difference p(i+1)-p(i-1) < 0 exactly 6 times.
A180884
Number of permutations p() of 1..n+7 with centered difference p(i+1)-p(i-1) < 0 exactly 6 times.
Terms
- a(0) =70a(1) =4662a(2) =203616a(3) =5517204a(4) =116189304a(5) =1997701992a(6) =29868078240a(7) =398942612640
External references
- oeis: A180884