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

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =4a(5) =1a(6) =4a(7) =13a(8) =7a(9) =1a(10) =8a(11) =38a(12) =33a(13) =10a(14) =1a(15) =16a(16) =104a(17) =129a(18) =62a(19) =13a(20) =1a(21) =32a(22) =272a(23) =450a(24) =304a(25) =100a(26) =16a(27) =1a(28) =64a(29) =688