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
- oeis: A269021