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 A026946 #10 Oct 18 2019 10:24:46 %S A026946 1,2,11,34,195,678,3989,14494,86515,321590,1936881,7301142,44241261, %T A026946 168359754,1024642875,3926147730,23973456915,92338836390,565280386625, %U A026946 2186194166950,13411044301945,52037098259090,319756851757695,1244063987615130,7655279183309725,29851422385561898 %N A026946 Self-convolution of array T given by A026374. %K A026946 nonn %O A026946 0,2 %A A026946 _Clark Kimberling_ %E A026946 More terms from _Sean A. Irvine_, Oct 17 2019