Expansion of (1 - 2*x - sqrt(1 - 4*x - 8*x^2))/(6*x^2).

Terms

a(0) =1a(1) =2a(2) =7a(3) =26a(4) =106a(5) =452a(6) =1999a(7) =9074a(8) =42046a(9) =198044a(10) =945430a(11) =4564100a(12) =22243060a(13) =109285256a(14) =540738943a(15) =2692103714a(16) =13475973238a(17) =67784600108a(18) =342439638418