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

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =4a(5) =6a(6) =8a(7) =11a(8) =16a(9) =22a(10) =32a(11) =46a(12) =64a(13) =92a(14) =128a(15) =179a(16) =256a(17) =358a(18) =512a(19) =730a(20) =1024a(21) =1460a(22) =2048a(23) =2878a(24) =4096a(25) =5756a(26) =8192a(27) =11644a(28) =16384a(29) =23288