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

Terms

a(0) =1a(1) =-3a(2) =1a(3) =7a(4) =-6a(5) =1a(6) =-15a(7) =23a(8) =-9a(9) =1a(10) =31a(11) =-72a(12) =48a(13) =-12a(14) =1a(15) =-63a(16) =201a(17) =-198a(18) =82a(19) =-15a(20) =1a(21) =127a(22) =-522a(23) =699a(24) =-420a(25) =125a(26) =-18a(27) =1a(28) =-255a(29) =1291