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 A026952 #9 Oct 18 2019 04:03:49
%S A026952 1,4,24,90,541,2032,12275,46472,282003,1075404,6549906,25125114,
%T A026952 153481299,591529776,3622111560,14013307170,85975792075,333669151420,
%U A026952 2050493623760,7978700883230,49098707209695,191470222802880,1179633190545755,4608890486329844,28423658754983701
%N A026952 a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+1), with T given by A026386.
%K A026952 nonn
%O A026952 1,2
%A A026952 _Clark Kimberling_
%E A026952 More terms from _Sean A. Irvine_, Oct 17 2019