a(n) = n*a(n-1) - (n-1)^2*a(n-2), a(0)=1, a(1)=1.

Terms

a(0) =1a(1) =1a(2) =1a(3) =-1a(4) =-13a(5) =-49a(6) =31a(7) =1981a(8) =14329a(9) =2177a(10) =-1138879a(11) =-12745369a(12) =-15140069a(13) =1638512239a(14) =25497843007a(15) =61319246261