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 A117557 #5 Oct 02 2013 16:16:06 %S A117557 1,2,5,16,22,31,72,270,342,1848,6421,6691,14618,26894,40006,54624, %T A117557 121524 %N A117557 Equal divisions of the octave of decreasing eleven-limit Pepper ambiguity. %C A117557 We may define the n-limit Pepper ambiguity, for any odd number n greater than one, as the maximum of the ratios of the errors of the nearest approximation to the members of the n-limit tonality diamond to the next nearest. %H A117557 Wikipedia, <a href="http://en.wikipedia.org/wiki/Tonality_diamond">Tonality diamond</a> %K A117557 more,nonn %O A117557 0,2 %A A117557 _Gene Ward Smith_, Mar 28 2006