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 A129107 #3 Mar 30 2012 16:50:41 %S A129107 4,2,2,2,3,4,4,4 %N A129107 Decimal expansion of 42223444 = 84446888/2 (see A129106). %D A129107 R. F. Fox and T. P. Hill, An exact value for Avogadro's number, American Scientist, 95 (No. 2, 2007), 104-107. %K A129107 nonn,cons %O A129107 8,1 %A A129107 _N. J. A. Sloane_, May 26 2007