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 A187089 #21 Dec 23 2016 05:55:22 %S A187089 2,4,7,3,9,4,6 %N A187089 Decimal expansion of the fractal dimension of the Apollonian sphere packing. %H A187089 M. Borkovec, W. de Paris, and R. Peikert, <a href="http://www.worldscientific.com/doi/abs/10.1142/S0218348X94000739">The Fractal Dimension of the Apollonian Sphere Packing</a>, Fractals, 2 (1994), pp. 521-526; <a href="https://www.researchgate.net/publication/228326605_The_Fractal_Dimension_of_the_Apollonian_Sphere_Packing">Preprint</a>. %e A187089 2.473946... %Y A187089 Cf. A052483. %K A187089 nonn,cons,more %O A187089 1,1 %A A187089 _Paul Muljadi_, Mar 08 2011