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

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =-1a(5) =1a(6) =3a(7) =4a(8) =-3a(9) =1a(10) =5a(11) =-5a(12) =10a(13) =-5a(14) =1a(15) =8a(16) =15a(17) =-25a(18) =20a(19) =-7a(20) =1a(21) =13a(22) =-22a(23) =65a(24) =-65a(25) =34a(26) =-9a(27) =1a(28) =21a(29) =57