Number of distinct shuffles of the identity permutation on n letters with the halfway-wrapped around permutation k+1,k+2,...,n-1,n,1,2,...,k where k=floor(n/2).

A145208

Number of distinct shuffles of the identity permutation on n letters with the halfway-wrapped around permutation k+1,k+2,...,n-1,n,1,2,...,k where k=floor(n/2).

Terms

    a(0) =1a(1) =4a(2) =13a(3) =54a(4) =197a(5) =792a(6) =2977a(7) =11750a(8) =44744a(9) =175066a(10) =671783a(11) =2619148a(12) =10104590

External references