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 A027141 #8 Oct 23 2019 22:08:25
%S A027141 3,23,165,1218,9247,71688,564759,4506005,36324407,295341956,
%T A027141 2418783687,19932773439,165151576215,1374850036253,11493442158373,
%U A027141 96443092570534,811995039077311,6857352935798972,58071096513853991,493014496906492215,4195315394988567303
%N A027141 a(n) = Sum_{k=0..2n-1} T(n,k) * T(n,k+1), with T given by A027113.
%K A027141 nonn
%O A027141 1,1
%A A027141 _Clark Kimberling_
%E A027141 More terms from _Sean A. Irvine_, Oct 23 2019