Number of permutations of [2n] containing an increasing subsequence of length n.

A269021

Number of permutations of [2n] containing an increasing subsequence of length n.

Terms

    a(0) =1a(1) =2a(2) =23a(3) =588a(4) =24553a(5) =1438112a(6) =108469917a(7) =9996042284

External references