Number of permutations of [2n+1] with exactly n increasing runs of length two.

A317140

Number of permutations of [2n+1] with exactly n increasing runs of length two.

Terms

    a(0) =1a(1) =4a(2) =43a(3) =906a(4) =31493a(5) =1629248a(6) =117248463a(7) =11190963430

External references