a(n) = 2^((n - 1)*(n + 2)/2)*3^(n*(n - 1))*n^n.A318197a(n) = 2^((n - 1)*(n + 2)/2)*3^(n*(n - 1))*n^n.Terms a(0) =1a(1) =144a(2) =629856a(3) =69657034752External referencesoeis: A318197