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 A193853 #6 Mar 30 2012 18:57:38 %S A193853 1,4,2,13,10,4,40,36,24,8,121,116,96,56,16,364,358,328,248,128,32, %T A193853 1093,1086,1044,904,624,288,64,3280,3272,3216,2992,2432,1536,640,128, %U A193853 9841,9832,9760,9424,8416,6400,3712,1408,256,29524,29514,29424,28944 %N A193853 Triangular array: (1/2)*A193851. %t A193853 (See A193851.) %Y A193853 Cf. A193851. %K A193853 nonn,tabl %O A193853 0,2 %A A193853 _Clark Kimberling_, Aug 07 2011