Expansion of (sqrt(1-4x)-x)/(1-4x).

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =6a(5) =-4a(6) =-100a(7) =-664a(8) =-3514a(9) =-16916a(10) =-77388a(11) =-343144a(12) =-1490148a(13) =-6376616a(14) =-26992264a(15) =-113317936a(16) =-472661434a(17) =-1961361076a(18) =-8104733884a(19) =-33374212936a(20) =-137031378124a(21) =-561253753336