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 A054158 #4 Mar 30 2012 16:48:46 %S A054158 1,3,2,5,4,10,9,21,26,48,70,136,209,389,673,1235,2221,4144,7631,14358, %T A054158 26941,51016,96783,184560,352454,675391,1296503,2494071,4805389, %U A054158 9273501,17919559,34670835,67156871,130218219,252741267,490988734 %N A054158 Inverse Moebius transform of A001371 (starting at term 0). %K A054158 nonn %O A054158 0,2 %A A054158 _N. J. A. Sloane_, Apr 29 2000