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 A027156 #8 Jun 23 2024 10:35:04 %S A027156 4,20,88,416,2464,12320,73344,373248,2286080,11768320,72968192, %T A027156 378533888,2368397312,12353986560,77788119040,407431675904, %U A027156 2577750163456,13544806547456,86015627231232,453128543010816,2886172831383552 %N A027156 Self-convolution of array T given by A027144. %K A027156 nonn %O A027156 0,1 %A A027156 _Clark Kimberling_