G.f. A(x) satisfies A( A(x) - x ) = A(x)^2.

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =8a(5) =14a(6) =16a(7) =-20a(8) =-232a(9) =-1100a(10) =-4120a(11) =-13494a(12) =-39620a(13) =-103376a(14) =-227520a(15) =-343520a(16) =179000a(17) =4418792a(18) =24500544a(19) =102237716a(20) =366621288a(21) =1170503856a(22) =3328282736a(23) =8147202910a(24) =15145509756a(25) =7777488948a(26) =-110050600352a(27) =-753145186372