Number of permutations of [2n] having exactly n consecutive ascending pairs.

A389311

Number of permutations of [2n] having exactly n consecutive ascending pairs.

Terms

    a(0) =1a(1) =1a(2) =3a(3) =30a(4) =385a(5) =6678a(6) =142758a(7) =3636204a(8) =107380845a(9) =3605877990a(10) =135653120746

External references