Number of permutations of 3 indistinguishable copies of 1..n arranged in a circle with exactly 3 local maxima.

A159723

Number of permutations of 3 indistinguishable copies of 1..n arranged in a circle with exactly 3 local maxima.

Terms

    a(0) =0a(1) =2a(2) =924a(3) =130672a(4) =11798800a(5) =882163680a(6) =60299781248

External references