Number of permutations p() of 1..n+8 with centered difference p(i+1)-p(i-1) < 0 exactly 7 times.

A180885

Number of permutations p() of 1..n+8 with centered difference p(i+1)-p(i-1) < 0 exactly 7 times.

Terms

    a(0) =126a(1) =13104a(2) =854700a(3) =32369568a(4) =917857512a(5) =20732684544a(6) =398942612640

External references