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 A171794 #13 Aug 06 2014 16:14:23 %S A171794 2,13,23,30,31,32,33,103,114,124,134,140,141,142,143,144,203,213,224, %T A171794 234,240,241,242,243,244,301,302,303,312,313,323,334,340,341,342,343, %U A171794 344,400,410,411,420,421,422,430,431,432,433,440,441,442 %N A171794 Numbers of rank 7 in the poset of lunar numbers. %H A171794 David Applegate and N. J. A. Sloane, <a href="/A171794/b171794.txt">Table of n, a(n) for n = 1..2725</a> %H A171794 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 A171794 <a href="/index/Di#dismal">Index entries for sequences related to dismal (or lunar) arithmetic</a> %K A171794 nonn,base %O A171794 1,1 %A A171794 _David Applegate_ and _N. J. A. Sloane_, Oct 14 2010