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 A026971 #11 Jun 23 2024 10:35:12 %S A026971 1,2,11,34,138,492,2342,8500,39814,148124,709266,2665932,12824196, %T A026971 48623448,235400988,897705096,4362689862,16713200556,81488683874, %U A026971 313281535180,1531312911148,5903966489576,28918583700468,111757786454424,548352142452124,2123323536391448 %N A026971 Self-convolution of array T given by A026648. %K A026971 nonn %O A026971 0,2 %A A026971 _Clark Kimberling_ %E A026971 More terms from _Sean A. Irvine_, Oct 20 2019