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 A026968 #8 Oct 20 2019 16:23:22
%S A026968 1,8,41,208,856,3552,14172,56462,223292,881656,3475141,13688112,
%T A026968 53891760,212145608,835111160,3287779006,12946154944,50989472460,
%U A026968 200879577216,791617503410,3120501139160,12304529289928,48533074308046,191488113441258,755744827552836,2983563960355832
%N A026968 a(n) = Sum_{k=0..n-2} T(n,k) * T(n,k+2), with T given by A026637.
%K A026968 nonn
%O A026968 2,2
%A A026968 _Clark Kimberling_
%E A026968 More terms from _Sean A. Irvine_, Oct 20 2019