G.f. satisfies A(x) = 1/(1-x) + x^4*A(x)^3.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =4a(6) =7a(7) =11a(8) =19a(9) =37a(10) =74a(11) =142a(12) =268a(13) =518a(14) =1033a(15) =2077a(16) =4152a(17) =8290a(18) =16687a(19) =33899a(20) =69148a(21) =141160a(22) =288650a(23) =592354a(24) =1220086a(25) =2519226a(26) =5210164a(27) =10794088a(28) =22408556a(29) =46613554