Number of pairs of length n permutations achievable by double-ended priority queue.

A007763

Number of pairs of length n permutations achievable by double-ended priority queue.

Terms

    a(0) =1a(1) =4a(2) =32a(3) =392a(4) =6488a(5) =135360a(6) =3408120a(7) =100520432a(8) =3398723928a(9) =129588803696

External references