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 A191342 #16 Aug 06 2014 15:54:07 %S A191342 0,0,0,1,3,9,23,59,145,346,787,1770,3899,8482,18337 %N A191342 2^(n-1)-A190820(n). %H A191342 D. Applegate, M. LeBrun and N. J. A. Sloane, <a href="http://arxiv.org/abs/1107.1130">Dismal Arithmetic</a> [Note: we have now changed the name from "dismal arithmetic" to "lunar arithmetic" - the old name was too depressing] %H A191342 <a href="/index/Di#dismal">Index entries for sequences related to dismal (or lunar) arithmetic</a> %Y A191342 Cf, A190820. %K A191342 base,nonn,more %O A191342 2,5 %A A191342 _N. J. A. Sloane_, Jun 01 2011