Number of self-inverse permutations of [2n] with longest increasing subsequence of length n.

A267436

Number of self-inverse permutations of [2n] with longest increasing subsequence of length n.

Terms

    a(0) =1a(1) =1a(2) =5a(3) =31a(4) =265a(5) =2446a(6) =26069a(7) =294386a(8) =3628517a(9) =46938514a(10) =645978814a(11) =9265791393a(12) =139408562319

External references