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 A027234 #8 Oct 27 2019 11:33:46
%S A027234 1,9,62,320,1837,8376,45666,198471,1065418,4523403,24247545,101589616,
%T A027234 547233490,2273356598,12341618508,50963502172,279167141052,
%U A027234 1147495086055,6344204700832,25979651242434,144938080884808,591635283209270,3328970814605391,13551109648829458,76853618775913752
%N A027234 a(n) = Sum_{k=0..n-3} T(n,k) * T(n,k+3), with T given by A026758.
%K A027234 nonn
%O A027234 3,2
%A A027234 _Clark Kimberling_
%E A027234 More terms from _Sean A. Irvine_, Oct 24 2019