G.f. satisfies A(x) = 1 + x*A(x)*(1 + x^4*A(x)^2).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =2a(6) =5a(7) =11a(8) =21a(9) =36a(10) =60a(11) =106a(12) =205a(13) =418a(14) =851a(15) =1685a(16) =3257a(17) =6264a(18) =12210a(19) =24276a(20) =48920a(21) =98873a(22) =199118a(23) =399472a(24) =801361a(25) =1613713a(26) =3266772a(27) =6640770a(28) =13526547a(29) =27564804