G.f. satisfies: A(x) = 1 + x*A(x)*A(-x) + x^2*A(x)/A(-x).

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =2a(5) =5a(6) =10a(7) =21a(8) =30a(9) =76a(10) =114a(11) =257a(12) =448a(13) =1052a(14) =1706a(15) =4093a(16) =6928a(17) =16284a(18) =28266a(19) =67580a(20) =116288a(21) =278582a(22) =488152a(23) =1168105a(24) =2060388a(25) =4959066a(26) =8772450a(27) =21133812a(28) =37675236a(29) =90901086