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 A026983 #8 Oct 20 2019 22:02:54
%S A026983 1,8,47,224,1130,4868,23404,97230,457264,1868456,8679894,35162196,
%T A026983 162087345,653396608,2996092939,12041970574,55006554003,220673343660,
%U A026983 1005105011265,4027407386110,18302390130349,73278803406040,332412585527847,1330205838019114,6025308727310905
%N A026983 a(n) = Sum_{k=0..n-2} T(n,k) * T(n,k+2), with T given by A026670.
%K A026983 nonn
%O A026983 2,2
%A A026983 _Clark Kimberling_
%E A026983 More terms from _Sean A. Irvine_, Oct 20 2019