This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A279307 #4 Dec 12 2016 09:16:43
%S A279307 0,1,1,5,137,647,22951,328201,26965819,135880897,37044323689,
%T A279307 91760237711,250120070812867,235374750708709,38112363401091809,
%U A279307 1747698886011364219,2880212454433162868027,1444514603466022486187,54349494835431693600323
%N A279307 Numerators of coefficients in expansion of (sinh x)/(1 + cos(sqrt(x))).
%H A279307 Clark Kimberling, <a href="/A279307/b279307.txt">Table of n, a(n) for n = 0..1000</a>
%e A279307 (0/1) + (1/2)x + (1/8)x^2 + (5/48)x^3 + ... ; 0/1, 1/2, 1/8, 5/48, ... = A279307/A279239.
%t A279307 z = 30; t = CoefficientList[Series[Sinh[x]/(1 + Cos[Sqrt[x]]), {x, 0, z}], x];
%t A279307 Numerator[t] (* A279307 *)
%t A279307 Denominator[t] (* A279239 *)
%Y A279307 Cf. A279239.
%K A279307 nonn,easy,frac
%O A279307 0,4
%A A279307 _Clark Kimberling_, Dec 11 2016