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 A093579 #8 Jul 29 2017 04:19:37 %S A093579 0,1,3,4,6,7,10,11,13,14,15,16,18,19,21,22,24,25,27,28,29,31,32,34,35, %T A093579 36,37,39,40,42,43,45,46,47,48,49,50,51,52,55,56,58,59,61,62,65,66,67, %U A093579 68,69,70,71,72,73,74,76,77,78,79,80,81,82,84,85,88,89,91,92,93,94,95 %N A093579 Take m sheets of paper, arrange them into piles, write on each sheet the cardinality (number of sheets) of its pile. Do this again, so each sheet is labeled by an ordered pair of positive integers. An integer m is in this sequence if there is a way to do this such that every sheet has a unique label, i.e., if A093578(m) > 0. %e A093579 4 is in this sequence because A093578(4) = 1 > 0; 5 is not in this sequence because A093578(5) = 0. %Y A093579 Cf. A000217, A093578. %K A093579 easy,nonn %O A093579 0,3 %A A093579 _Howard A. Landman_, Apr 01 2004