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 A054172 #4 Mar 30 2012 16:48:46 %S A054172 1,2,2,3,3,6,6,12,18,32,52,100,171,322,589,1103,2049,3877,7281,13830, %T A054172 26221,49982,95326,182470,349523,671260,1290573,2485827,4793491, %U A054172 9257016,17895680,34637936,67108917,130152543,252645143,490857374 %N A054172 Inverse Moebius transform of A000048 (starting at term 0). %K A054172 nonn %O A054172 0,2 %A A054172 _N. J. A. Sloane_, Apr 29 2000