Number of ordered pairs (p,q) of permutations of [n] with equal up-down signatures and p(1)=q(1)=6.

A321062

Number of ordered pairs (p,q) of permutations of [n] with equal up-down signatures and p(1)=q(1)=6.

Terms

    a(0) =1216a(1) =19312a(2) =467696a(3) =15608288a(4) =678914816a(5) =37083546112

External references