G.f. satisfies: A(x) = x + A(x^2 + A(x^3 + A(x^4 + A(x^5 +...)))).

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =3a(5) =6a(6) =10a(7) =20a(8) =38a(9) =75a(10) =145a(11) =288a(12) =571a(13) =1147a(14) =2304a(15) =4652a(16) =9413a(17) =19133a(18) =38999a(19) =79753a(20) =163489a(21) =335996a(22) =692028a(23) =1428351a(24) =2953637a(25) =6118456a(26) =12694486a(27) =26377235a(28) =54881902a(29) =114333228