G.f. satisfies A(x) = x + ( Sum_{n>=1} A(x^n) )^3.

Terms

a(0) =1a(1) =0a(2) =1a(3) =3a(4) =9a(5) =25a(6) =72a(7) =213a(8) =635a(9) =1950a(10) =6036a(11) =19021a(12) =60429a(13) =194172a(14) =628384a(15) =2049225a(16) =6722658a(17) =22178631a(18) =73523028a(19) =244805574a(20) =818317630a(21) =2745167418a(22) =9238878207a(23) =31185404902a(24) =105550046640a(25) =358134472293