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 A027294 #6 May 07 2023 17:06:59 %S A027294 1,2,6,20,56,208,493,1974,4336,18258,38380,167464,342056,1532376, %T A027294 3067156,14022168,27646080,128438893,250291902,1178090212,2274524200, %U A027294 10822168448,20736353110,99564168884,189575748320,917316990660 %N A027294 Self-convolution of row n of array T given by A026022. %Y A027294 Cf. A026022. %K A027294 nonn %O A027294 0,2 %A A027294 _Clark Kimberling_