Number of permutations p of [2n] such that the up-down signature of 0,p has nonnegative partial sums with a maximal value of n.
A266947
Number of permutations p of [2n] such that the up-down signature of 0,p has nonnegative partial sums with a maximal value of n.
Terms
- a(0) =1a(1) =1a(2) =11a(3) =130a(4) =4734a(5) =127538a(6) =11174035a(7) =554432537a(8) =92953037066
External references
- oeis: A266947