Number of permutations of [n] having exactly n pairs of integers i<j in [n] such that their cycle minima have opposite sorting order.

A381545

Number of permutations of [n] having exactly n pairs of integers i<j in [n] such that their cycle minima have opposite sorting order.

Terms

    a(0) =1a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =28a(7) =239a(8) =2789a(9) =24970a(10) =247089a(11) =2289028a(12) =23926282a(13) =244031780a(14) =2795283827a(15) =32671509063a(16) =426329260855

External references