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 A101286 #12 Aug 08 2015 21:19:54
%S A101286 55,58,62,65,69,73,78,82,87,92,98,104,110,117,123,131,139,147,156,165,
%T A101286 175,185,196,208,220,233,247,262,277,294,311,330,349,370,392,415,440,
%U A101286 466,494,523,554,587,622,659,698,740,784,831,880,932,988,1047,1109,1175
%N A101286 Rounded frequencies in Hz of the notes of the chromatic music scale beginning at A.
%C A101286 The scale is equal-tempered. ("Wohltemperiert", introduced by Johann Sebastian Bach.)
%H A101286 T. Yahaya Abdullah, <a href="http://www.angelfire.com/in2/yala/4scales.htm">Music Scales</a>, part of Synthesizers, Music and Television.
%H A101286 Wikipedia, <a href="http://en.wikipedia.org/wiki/Equal_temperament">Equal temperament</a>
%F A101286 a(1+n) = round(55*2^(n/12)). - _R. J. Mathar_, Mar 12 2008
%p A101286 A101286 := proc(n) round( 55*2.0^((n-1)/12.0)) ; end: seq(A101286(n),n=1..80) ; # _R. J. Mathar_, Mar 12 2008
%Y A101286 Cf. A071831, A071832, A071833.
%K A101286 nonn
%O A101286 1,1
%A A101286 Angela Johansson (angvi798(AT)student.liu.se), Dec 20 2004
%E A101286 Corrected by _T. D. Noe_, Nov 02 2006
%E A101286 More terms from _R. J. Mathar_, Mar 12 2008