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 A272262 #5 Apr 24 2016 12:53:34 %S A272262 0,48,218592 %N A272262 Number of true systems of magical circles of order n. %H A272262 C. G. P. Kuschke, <a href="http://dx.doi.org/10.1090/S0002-9904-1934-05950-0">Magic circles</a>, Bull. Amer. Math. Soc. 40 (1934), 709-710. %Y A272262 Cf. A006052. %K A272262 nonn,more,bref %O A272262 2,2 %A A272262 _Michel Marcus_, Apr 24 2016