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 A048173 #28 Nov 29 2013 21:34:30 %S A048173 1,2,12,122,1740,31922,715932,18978122,580513260 %N A048173 Duplicate of A058349. %C A048173 This was actually created before A058349, but because of cross-references etc. it was easier to merge this with A058349 rather than the other way around. %K A048173 dead %O A048173 1,2 %A A048173 _N. J. A. Sloane_