G.f. A satisfies -x+(1+x^3-x)*A+(x^4-x^2)*A^2+(x^5-x^3)*A^3-x^4*A^4 = 0.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =4a(6) =8a(7) =16a(8) =33a(9) =69a(10) =145a(11) =306a(12) =651a(13) =1398a(14) =3026a(15) =6590a(16) =14425a(17) =31720a(18) =70040a(19) =155229a(20) =345193a(21) =770002a(22) =1722487a(23) =3863274a(24) =8685608a(25) =19570860a(26) =44188976a(27) =99965361a(28) =226548082a(29) =514275345