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 A193849 #5 Mar 30 2012 18:57:38 %S A193849 1,4,2,13,14,4,40,68,40,8,121,284,256,104,16,364,1094,1336,824,256,32, %T A193849 1093,4010,6196,5144,2416,608,64,3280,14216,26608,27824,17536,6656, %U A193849 1408,128,9841,49208,108256,136688,108256,55040,17536,3200,256,29524 %N A193849 Triangular array: (1/2)*A193847. %t A193849 (See A193847.) %Y A193849 Cf. A193847. %K A193849 nonn,tabl %O A193849 0,2 %A A193849 _Clark Kimberling_, Aug 07 2011