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 A054181 #4 Mar 30 2012 16:48:46 %S A054181 1,2,3,4,5,8,9,13,21,29,45,73,123,200,369,625,1163,2082,3915,7186, %T A054181 13659,25528,48735,92287,176911,337718,649553,1247065,2405237,4636787, %U A054181 8964801,17335426,33588281,65109226,126390045,245494391,477353377 %N A054181 Inverse Moebius transform of A000011 (starting at term 0). %K A054181 nonn %O A054181 0,2 %A A054181 _N. J. A. Sloane_, Apr 29 2000