Expansion of 1/(1 - 4 * Sum_{k>=0} x^(2^k))^(1/2).

Terms

a(0) =1a(1) =2a(2) =8a(3) =32a(4) =138a(5) =604a(6) =2696a(7) =12176a(8) =55512a(9) =254888a(10) =1177064a(11) =5461040a(12) =25435296a(13) =118856272a(14) =556962928a(15) =2616287392a(16) =12315914698a(17) =58084552572a(18) =274395134600