a(n) = 2^n * Lucas(n) * (n-1)!.

A097632

a(n) = 2^n * Lucas(n) * (n-1)!.

Terms

    a(0) =2a(1) =12a(2) =64a(3) =672a(4) =8448a(5) =138240a(6) =2672640a(7) =60641280a(8) =1568931840a(9) =45705461760

External references