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 A079731 #6 Feb 04 2015 09:12:26 %S A079731 28,55,110,220,440,880,1760,3520 %N A079731 Fundamental piano frequencies in Hertz rounded to nearest integer. %H A079731 J. Campbell, <a href="http://www.izzy.net/~jc/PSTInfo/Temper.html">The Equal Tempered Scale and Peculiarities of Piano Tuning</a>. %H A079731 <a href="/index/Mu#music">Index entries for sequences based on music</a> %F A079731 a(n)=round(27.5*2^n), n=0...7. %Y A079731 Cf. A214832, A254531. %K A079731 easy,fini,full,nonn %O A079731 0,1 %A A079731 _Ralf Stephan_, Feb 18 2003