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 A172023 #6 May 22 2013 11:03:12 %S A172023 1,1,1,3,5,13,38,133,534 %N A172023 Number of Sona graphs. %C A172023 See Table 1, column 2 of the paper by E. D. Demaine et al. for details. %H A172023 E. D. Demaine, M. L. Demaine, P. Taslakian and G. T. Toussaint, <a href="http://www.tandfonline.com/doi/full/10.1080/17513470701413451">Sand drawings and Gaussian graphs</a>, Journal of Mathematics and the Arts, 1 (2007), 125-133. %e A172023 The number of Sona graphs with nine faces is 534. %K A172023 nonn,more %O A172023 1,4 %A A172023 _Parthasarathy Nambi_, Jan 22 2010