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 A054539 #4 Mar 30 2012 16:48:46 %S A054539 1,1,2,3,5,8,15,26,47,86,158,293,548,1024,1928,3643,6899,13108,24970, %T A054539 47663,91181,174768,335546,645278,1242767,2396746,4628198,8947868, %U A054539 17318417,33554432,65075294,126322568,245426708 %N A054539 A000016 / 2. %Y A054539 A063776(n) / 4, n>2. %K A054539 nonn %O A054539 3,3 %A A054539 _N. J. A. Sloane_, Apr 10 2000