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 A027169 #4 Mar 30 2012 18:56:14 %S A027169 4,33,128,976,4032,30576,129024,976896,4188160,31728128,137478144, %T A027169 1042407424,4552310784,34549346304,151786618880,1152969736192, %U A027169 5089355366400,38688841924608,171431270809600,1304107929305088 %N A027169 a(n) = self-convolution of row n of array T given by A027157. %K A027169 nonn %O A027169 0,1 %A A027169 _Clark Kimberling_