Riordan array ((1-3x+x^2)/(1-4x+3x^2), x(1-2x)/(1-4x+3x^2)).

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =3a(5) =1a(6) =5a(7) =9a(8) =5a(9) =1a(10) =14a(11) =28a(12) =20a(13) =7a(14) =1a(15) =41a(16) =89a(17) =75a(18) =35a(19) =9a(20) =1a(21) =122a(22) =285a(23) =273a(24) =154a(25) =54a(26) =11a(27) =1a(28) =365a(29) =913