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

Terms

a(0) =1a(1) =-1a(2) =1a(3) =0a(4) =-3a(5) =1a(6) =1a(7) =5a(8) =-5a(9) =1a(10) =-1a(11) =-6a(12) =14a(13) =-7a(14) =1a(15) =0a(16) =6a(17) =-29a(18) =27a(19) =-9a(20) =1a(21) =1a(22) =-6a(23) =50a(24) =-76a(25) =44a(26) =-11a(27) =1a(28) =-1a(29) =7