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 A161813 #23 Aug 06 2014 17:23:29 %S A161813 8,7,6,5,4,3,2,1,0,9,9,8,7,6,5,4,3,2,1,8,8,8,7,6,5,4,3,2,1,7,7,7,7,6, %T A161813 5,4,3,2,1,6,6,6,6,6,5,4,3,2,1,5,5,5,5,5,5,4,3,2,1,4,4,4,4,4,4,4,3,2, %U A161813 1,3,3,3,3,3,3,3,3,2,1,2,2,2,2,2,2,2,2,2,1,1,1,1,1,1,1,1,1,1,1,10,9,8,7,6,5 %N A161813 Rank of n in the lunar poset. %H A161813 David Applegate, <a href="/A161813/b161813.txt">Table of n, a(n) for n = 1..100000</a> %H A161813 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 A161813 <a href="/index/Di#dismal">Index entries for sequences related to dismal (or lunar) arithmetic</a> %e A161813 Ranks of the numbers 1 through 99, written in 10 groups of 10 (the dash is for n=0, where the rank is undefined): %e A161813 - 8 7 6 5 4 3 2 1 0 (1 has rank 8, 2 has rank 7, etc.) %e A161813 9 9 8 7 6 5 4 3 2 1 (10 has rank 9, 11 has rank 9, etc.) %e A161813 8 8 8 7 6 5 4 3 2 1 %e A161813 7 7 7 7 6 5 4 3 2 1 %e A161813 6 6 6 6 6 5 4 3 2 1 %e A161813 5 5 5 5 5 5 4 3 2 1 %e A161813 4 4 4 4 4 4 4 3 2 1 %e A161813 3 3 3 3 3 3 3 3 2 1 %e A161813 2 2 2 2 2 2 2 2 2 1 %e A161813 1 1 1 1 1 1 1 1 1 1 %Y A161813 Cf. A161813, A144171, A144175, A171786, A171787, A171788, A171789, A171794, A171795, A171796, A191752, A191753. %K A161813 nonn,base %O A161813 1,1 %A A161813 _David Applegate_, _Marc LeBrun_ and _N. J. A. Sloane_, Aug 20 2010