Exponential Riordan array (e^(-x(1+x)),x).

Terms

a(0) =1a(1) =-1a(2) =1a(3) =-1a(4) =-2a(5) =1a(6) =5a(7) =-3a(8) =-3a(9) =1a(10) =1a(11) =20a(12) =-6a(13) =-4a(14) =1a(15) =-41a(16) =5a(17) =50a(18) =-10a(19) =-5a(20) =1a(21) =31a(22) =-246a(23) =15a(24) =100a(25) =-15a(26) =-6a(27) =1a(28) =461a(29) =217