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 A026981 #11 Jun 23 2024 10:35:08 %S A026981 1,2,11,34,173,586,2917,10262,50503,181334,885831,3221146,15652239, %T A026981 57405038,277822147,1025177314,4945846997,18333973274,88224662549, %U A026981 328195843910,1576001732485,5879010027618,28181895551161,105362519875518,504329070986033,1888952213601906 %N A026981 Self-convolution of array T given by A026670. %K A026981 nonn %O A026981 0,2 %A A026981 _Clark Kimberling_ %E A026981 More terms from _Sean A. Irvine_, Oct 20 2019