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

Terms

a(0) =1a(1) =1a(2) =4a(3) =11a(4) =33a(5) =100a(6) =305a(7) =937a(8) =2890a(9) =8943a(10) =27741a(11) =86216a(12) =268355a(13) =836297a(14) =2608818a(15) =8144875a(16) =25446229a(17) =79545148a(18) =248780979a(19) =778400001a(20) =2436380402a(21) =7628211951a(22) =23890103153a(23) =74836927720a(24) =234478937321a(25) =734802907841