Number of permutations of 1..n arranged in a circle with exactly 8 adjacent element pairs in decreasing order.

A151581

Number of permutations of 1..n arranged in a circle with exactly 8 adjacent element pairs in decreasing order.

Terms

    a(0) =0a(1) =9a(2) =5020a(3) =526240a(4) =26441856a(5) =862140162a(6) =21078701112a(7) =419567641380

External references