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

Terms

a(0) =1a(1) =-1a(2) =3a(3) =-3a(4) =11a(5) =-5a(6) =51a(7) =35a(8) =335a(9) =689a(10) =3055a(11) =9073a(12) =33891a(13) =114425a(14) =413623a(15) =1464661a(16) =5304803a(17) =19199859a(18) =70161499a(19) =257270227a(20) =948639463a(21) =3511150611a(22) =13047799395a(23) =48649126799a(24) =181968324231a(25) =682577156519