Number of down-up permutations of n+6 starting with n+1.

A006215

Number of down-up permutations of n+6 starting with n+1.

Terms

    a(0) =0a(1) =16a(2) =122a(3) =800a(4) =5296a(5) =36976a(6) =275792a(7) =2204480a(8) =18870016a(9) =172585936a(10) =1681843712a(11) =17411416160a(12) =190939611136

External references