Generating function A(x) satisfies A(x) = (1+x)^2*A(x^2)^2, with A(0)=1.

Terms

a(0) =1a(1) =2a(2) =5a(3) =8a(4) =18a(5) =28a(6) =50a(7) =72a(8) =129a(9) =186a(10) =301a(11) =416a(12) =664a(13) =912a(14) =1368a(15) =1824a(16) =2730a(17) =3636a(18) =5234a(19) =6832a(20) =9788a(21) =12744a(22) =17724a(23) =22704a(24) =31506a(25) =40308a(26) =54730a(27) =69152a(28) =93592a(29) =118032