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 A027278 #8 Oct 26 2019 22:42:37
%S A027278 2,8,60,312,2030,11752,74174,450292,2829898,17572000,110733420,
%T A027278 695885000,4403631638,27874477216,177101756296,1126506215424,
%U A027278 7182056699722,45847087891480,293141734241436,1876495434801400,12026885684352138,77161051350902456,495534832203481122
%N A027278 a(n) = Sum_{k=0..2n-1} T(n,k) * T(n,k+1), with T given by A026568.
%K A027278 nonn
%O A027278 1,1
%A A027278 _Clark Kimberling_
%E A027278 More terms from _Sean A. Irvine_, Oct 26 2019