Expansion of 1/(sqrt(1-2x-3x^2)-x).

Terms

a(0) =1a(1) =2a(2) =6a(3) =18a(4) =56a(5) =176a(6) =558a(7) =1778a(8) =5686a(9) =18230a(10) =58558a(11) =188366a(12) =606588a(13) =1955044a(14) =6305418a(15) =20347342a(16) =65689088a(17) =212146400a(18) =685342218a(19) =2214556478a(20) =7157409064a(21) =23136645472a(22) =74801223162a(23) =241863933094a(24) =782131232390