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

Terms

a(0) =0a(1) =0a(2) =1a(3) =2a(4) =7a(5) =24a(6) =89a(7) =342a(8) =1355a(9) =5492a(10) =22669a(11) =94962a(12) =402703a(13) =1725424a(14) =7458065a(15) =32482798a(16) =142414867a(17) =628037612a(18) =2783922197a(19) =12397342698a(20) =55436525591a(21) =248819728360