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 A026982 #8 Oct 20 2019 22:03:03
%S A026982 1,6,24,120,460,2214,8475,40164,154235,724742,2792579,13050280,
%T A026982 50432693,234766510,909442512,4221139640,16384219216,75873259406,
%U A026982 294977735364,1363503281324,5308113306398,24499364386598,95483014454706,440147035814920,1717035728143720,7906666535747934
%N A026982 a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+1), with T given by A026670.
%K A026982 nonn
%O A026982 1,2
%A A026982 _Clark Kimberling_
%E A026982 More terms from _Sean A. Irvine_, Oct 20 2019