G.f. satisfies: A(x) = x + A( A(x)^3 + A(x)^4 ).

Terms

a(0) =1a(1) =0a(2) =1a(3) =1a(4) =3a(5) =7a(6) =16a(7) =45a(8) =111a(9) =311a(10) =834a(11) =2329a(12) =6521a(13) =18429a(14) =52667a(15) =151095a(16) =437178a(17) =1270035a(18) =3710065a(19) =10882077a(20) =32044740a(21) =94700739a(22) =280749180a(23) =834793837a(24) =2488822697a(25) =7438604115a(26) =22283235185a(27) =66893731444a(28) =201208674387a(29) =606321286160