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 A226204 #16 Mar 05 2015 13:00:56 %S A226204 9,9,3,6,2,2 %N A226204 Decimal expansion of the length (in meters) of the seconds pendulum, a pendulum whose period is two seconds at standard gravity. %C A226204 This length is very close to 1 because g ~ 9.81 is very close to Pi^2 ~ 9.87. Its equivalent in inches is 39.1189. %H A226204 P. Agnoli and G. D’Agostini, <a href="http://arxiv.org/abs/physics/0412078">Why does the meter beat the second?</a> arXiv:physics/0412078 [physics.hist-ph] 25 Jan 2005 %H A226204 Istituto Nazionale di Fisica Nucleare, <a href="http://www.roma1.infn.it/~dagos/history/sm/node3.html">The seconds pendulum</a> %H A226204 Wikipedia, <a href="http://en.wikipedia.org/wiki/Seconds_pendulum">Seconds pendulum</a> %F A226204 g/Pi^2 %e A226204 0.993622 %t A226204 g/Pi^2 /. g -> 9.80665`6 // RealDigits // First %Y A226204 Cf. A072915 %K A226204 nonn,cons %O A226204 0,1 %A A226204 _Jean-François Alcover_, May 31 2013