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 A026953 #9 Oct 18 2019 04:03:57
%S A026953 1,8,41,272,1168,7428,30302,189808,759101,4724160,18728841,116207424,
%T A026953 458829051,2842936320,11203933255,69378730880,273211969075,
%U A026953 1691519468760,6660034471595,41235710124400,162381981186970,1005560117623204,3961069262796800,24534901740913872
%N A026953 a(n) = Sum_{k=0..n-2} T(n,k) * T(n,k+2), with T given by A026386.
%K A026953 nonn
%O A026953 2,2
%A A026953 _Clark Kimberling_
%E A026953 More terms from _Sean A. Irvine_, Oct 17 2019