G.f. A(x,y) satisfies: A(x,y) = x*y + A(x,x*y)^2, with A(0,y) = 1.

Terms

a(0) =1a(1) =0a(2) =1a(3) =0a(4) =2a(5) =0a(6) =4a(7) =0a(8) =8a(9) =1a(10) =0a(11) =16a(12) =4a(13) =0a(14) =32a(15) =14a(16) =0a(17) =64a(18) =40a(19) =0a(20) =128a(21) =108a(22) =2a(23) =0a(24) =256a(25) =272a(26) =12a(27) =0a(28) =512a(29) =664