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 A209156 #8 Feb 16 2014 16:21:20 %S A209156 1,1,1,1,2,1,1,1,1,1,1,1,3,2,1,1,1,1,2,1,1,1,1,3,4,2,2,1,1,1,3,3,1,3, %T A209156 1,1 %N A209156 Triangle read by rows: denominators of Stirling-like triangle of rational numbers. %H A209156 Joseph M. Santmyer, <a href="http://dx.doi.org/10.1016/S0012-365X(96)00082-9">A Stirling like sequence of rational numbers</a>, Discrete Math. 171 (1997), no. 1-3, 229-235. MR1454453. %e A209156 Triangle begins: %e A209156 -1, %e A209156 -1,1, %e A209156 -1,3/2,-1, %e A209156 -1,1,-2,1, %e A209156 -1,5,-5/3,5/2,-1, %e A209156 -1,1,-5,5/2,-3,1, %e A209156 -1,7,-7/3,35/4,-7/2,7/2,-1, %e A209156 -1,4,-28/3,7/3,-14,14/3,-4,1,... %Y A209156 Cf. A209155. %K A209156 nonn,frac,tabl,more %O A209156 1,5 %A A209156 _N. J. A. Sloane_, Mar 05 2012