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 A048638 #5 Oct 04 2012 10:28:38 %S A048638 1,4,9,21,42,86,171,358,715,1431 %N A048638 Height of lattice of parameters of mixed orthogonal arrays with 2^n runs and strength 2. %H A048638 E. M. Rains, N. J. A. Sloane and J. Stufken, The Lattice of N-Run Orthogonal Arrays, J. Stat. Planning Inference, 102 (2002), 477-500 (<a href="http://neilsloane.com/doc/rao.txt">Abstract</a>, <a href="http://neilsloane.com/doc/rao.pdf">pdf</a>, <a href="http://neilsloane.com/doc/rao.ps">ps</a>) %Y A048638 Cf. A039930, A048164. %K A048638 nonn,nice %O A048638 0,2 %A A048638 _N. J. A. Sloane_, E. M. Rains, J. Stufken