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 A263860 #7 Oct 31 2015 14:40:31 %S A263860 1,1,1,1,1,2,1,0,0,1,1,3,2,2,1,3,0,2,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,1, %T A263860 1,4,3,5,3,7,2,5,2,4,1,4,0,2,2,2,0,2,0,4,0,0,0,2,1,0,0,0,0,3,0,0,0,0, %U A263860 0,0,0,0,0,2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0 %N A263860 Triangle read by rows: T(n,k) (n>=0, k>=1) is the number of posets with n elements and k linear extensions. %C A263860 Row sums give A000112. %H A263860 FindStat - Combinatorial Statistic Finder, <a href="http://www.findstat.org/StatisticsDatabase/St000100">The number of linear extensions of a poset</a>. %e A263860 Triangle begins: %e A263860 1, %e A263860 1, %e A263860 1,1, %e A263860 1,2,1,0,0,1, %e A263860 1,3,2,2,1,3,0,2,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,1, %e A263860 ... %Y A263860 Cf. A000112. %K A263860 nonn,tabf %O A263860 0,6 %A A263860 _Christian Stump_, Oct 28 2015