Riordan array (((1+x)^2 - x^3)/(1+x)^3, 1/(1+x)).

Terms

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