a(n) = n!*Fibonacci(n+1).

Terms

a(0) =1a(1) =1a(2) =4a(3) =18a(4) =120a(5) =960a(6) =9360a(7) =105840a(8) =1370880a(9) =19958400a(10) =322963200a(11) =5748019200a(12) =111607372800