G.f. satisfies: A(x) = Product_{n>=0} (1 + x*(x+x^2)^n)/(1 - x*(x+x^2)^n).

Terms

a(0) =1a(1) =2a(2) =4a(3) =10a(4) =22a(5) =48a(6) =104a(7) =222a(8) =466a(9) =966a(10) =1988a(11) =4060a(12) =8222a(13) =16528a(14) =33024a(15) =65620a(16) =129698a(17) =255096a(18) =499508a(19) =974032a(20) =1891866a(21) =3661034a(22) =7060324a(23) =13572010a(24) =26009822a(25) =49701946a(26) =94714606a(27) =180022550a(28) =341316642a(29) =645594510