Number of permutations of [2n] with exactly n cycles such that the elements of each cycle form an integer interval.

A287899

Number of permutations of [2n] with exactly n cycles such that the elements of each cycle form an integer interval.

Terms

    a(0) =1a(1) =1a(2) =5a(3) =31a(4) =217a(5) =1661a(6) =13721a(7) =121703a(8) =1157857a(9) =11826121a(10) =129877645a(11) =1535504015a(12) =19546846441a(13) =267633414517

External references