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%I #7 Dec 10 2016 22:38:52
%S 1,1,11,301,15371,1261501,21692333,2291003591,5515342166891,
%T 219856146354043,533289474412481051,224671379367784281901,
%U 112978424972711121811,3528028730755504686511279,46211522130188693681603906171,5237381988676259999443664085643
%N Numerators of coefficients in expansion of 1/(-1 + 2 cos(sqrt(x))).
%H Clark Kimberling, <a href="/A279181/b279181.txt">Table of n, a(n) for n = 0..1000</a>
%e 1/1 + (1/1)x + (11/12)x^2 + (301/360)x^3 + ... ; 1/1, 1/1, 11/12, 301/360, ... = A279181/A279182.
%t z = 26; t = CoefficientList[Series[1/(-1 + 2 Cos[Sqrt[x]]), {x, 0, z}], x];
%t Numerator[t] (* A279181 *)
%t Denominator[t] (* A279182 *)
%Y Cf. A279182.
%K nonn,easy,frac
%O 0,3
%A _Clark Kimberling_, Dec 08 2016
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