G.f.: A(x) = Product_{n>=1} [ (1-x)^2*(1 + 2x + 3x^2 +...+ n*x^(n-1)) ].

Terms

a(0) =1a(1) =-2a(2) =-2a(3) =4a(4) =-1a(5) =12a(6) =-26a(7) =38a(8) =-51a(9) =6a(10) =98a(11) =-190a(12) =138a(13) =60a(14) =132a(15) =-1296a(16) =2990a(17) =-3738a(18) =3350a(19) =-3752a(20) =4077a(21) =1194a(22) =-12272a(23) =18528a(24) =-14848a(25) =9018a(26) =-2002a(27) =5644a(28) =-86729a(29) =290596