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 A140646 #3 Mar 30 2012 16:50:50 %S A140646 0,13,15,20,21,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,43,44, %T A140646 45,46,48,49,50 %N A140646 Number of stars on the flag of the United States as it has changed over the years since 1775. %C A140646 The flag is also known as the Stars and Stripes, Old Glory and the Star-Spangled Banner. %C A140646 The proportions of the flag are 10 X 19. %H A140646 USHistory.org, <a href="http://www.ushistory.org/betsy/flagfact.html">Flag Timeline</a>. %H A140646 Wikipedia, <a href="http://en.wikipedia.org/wiki/Flag_of_the_United_States">Flag of the United States</a> %H A140646 Wikipedia, <a href="http://en.wikipedia.org/wiki/Flag_Acts_%28United_States%29">Flag Acts (United States)</a> %e A140646 In 2008 the flag has 50 stars and 13 stripes. %Y A140646 Cf. A053726. %K A140646 nonn %O A140646 1,2 %A A140646 Lane A. Phillips (lanephillips(AT)gmail.com), Jul 09 2008 %E A140646 Edited by _N. J. A. Sloane_, Jul 31 2008