Number of permutations of 2 indistinguishable copies of 1..n with exactly 7 adjacent element pairs in decreasing order.

A151629

Number of permutations of 2 indistinguishable copies of 1..n with exactly 7 adjacent element pairs in decreasing order.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =0a(4) =232a(5) =450048a(6) =163809288a(7) =27306899520

External references