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 A101206 #3 Mar 30 2012 16:50:07 %S A101206 1,2,5,22,112 %N A101206 Third column of triangle in A101204. %D A101206 A. T. Balaban, Enumeration of Cyclic Graphs, pp. 63-105 of A. T. Balaban, ed., Chemical Applications of Graph Theory, Ac. Press, 1976; see p. 92. %K A101206 nonn %O A101206 2,2 %A A101206 _N. J. A. Sloane_, Dec 13 2004