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 A166361 #3 Mar 31 2012 10:28:38 %S A166361 1,1,1,1,4,4,1,1,5,4,1,1 %N A166361 Scale degrees of the roots of chords in a traditional "twelve-bar blues" in Western music. %F A166361 Tonic * 4; Subdominant * 2; Tonic * 2; Dominant; Subdominant; Tonic * 2 %e A166361 In key of C: C7 C7 C7 C7 F7 F7 C7 C7 G7 F7 C7 C7 %K A166361 easy,nonn,fini,full %O A166361 1,5 %A A166361 _Ethan Beihl_, Oct 12 2009 %E A166361 Keyword:fini,full added by _R. J. Mathar_, Oct 14 2009