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 A026966 #8 Oct 20 2019 16:28:04 %S A026966 1,2,6,34,116,438,1606,6002,22548,85342,324716,1241166,4762000, %T A026966 18329054,70742790,273689362,1061055812,4121135838,16032654628, %U A026966 62463904958,243682621224,951781620022,3721520393036,14565753339054,57060974849656,223721451300518,877830004120296 %N A026966 Self-convolution of array T given by A026637. %K A026966 nonn %O A026966 0,2 %A A026966 _Clark Kimberling_ %E A026966 More terms from _Sean A. Irvine_, Oct 20 2019