a(n) = n*(a(n-1)-4), a(0) = 1.

Terms

a(0) =1a(1) =-3a(2) =-14a(3) =-54a(4) =-232a(5) =-1180a(6) =-7104a(7) =-49756a(8) =-398080a(9) =-3582756a(10) =-35827600a(11) =-394103644a(12) =-4729243776a(13) =-61480169140a(14) =-860722368016