a(n)=n*(a(n-1)-3), a(0)=1.

Terms

a(0) =1a(1) =-2a(2) =-10a(3) =-39a(4) =-168a(5) =-855a(6) =-5148a(7) =-36057a(8) =-288480a(9) =-2596347a(10) =-25963500a(11) =-285598533a(12) =-3427182432a(13) =-44553371655a(14) =-623747203212