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 A171796 #15 Aug 06 2014 16:14:23 %S A171796 10,11,101,112,120,121,122,200,210,211,220,221,222,1001,1011,1020, %T A171796 1101,1113,1123,1130,1131,1132,1133,1212,1223,1230,1231,1232,1233, %U A171796 1300,1310,1311,1320,1321,1322,1330,1331,1332,1333,2010,2020,2120 %N A171796 Numbers of rank 9 in the poset of lunar numbers. %H A171796 David Applegate and N. J. A. Sloane, <a href="/A171796/b171796.txt">Table of n, a(n) for n = 1..494</a> %H A171796 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 A171796 <a href="/index/Di#dismal">Index entries for sequences related to dismal (or lunar) arithmetic</a> %Y A171796 Cf. A161813, A144171, A144175, A171786, A171787, A171788, A171789, A171794, A171795, A171796, A191752, A191753. %K A171796 nonn,base %O A171796 1,1 %A A171796 _David Applegate_ and _N. J. A. Sloane_, Oct 14 2010