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

Terms

a(0) =1a(1) =2a(2) =1a(3) =4a(4) =6a(5) =1a(6) =8a(7) =24a(8) =10a(9) =1a(10) =16a(11) =80a(12) =60a(13) =14a(14) =1a(15) =32a(16) =240a(17) =280a(18) =112a(19) =18a(20) =1a(21) =64a(22) =672a(23) =1120a(24) =672a(25) =180a(26) =22a(27) =1a(28) =128a(29) =1792