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 A027304 #12 Jan 03 2024 06:29:48
%S A027304 5,14,126,384,2355,7568,39545,131768,632177,2162510,9853892,34384064,
%T A027304 151498203,536917884,2311543325,8295107912,35123988977,127340511540,
%U A027304 532611748052,1947506206400,8069978842770,29721855687264,122273332182351,453128454670472
%N A027304 a(n) = Sum_{k=0..floor((n-5)/2)} T(n,k) * T(n,k+1), with T given by A008315.
%Y A027304 Cf. A008315.
%K A027304 nonn
%O A027304 5,1
%A A027304 _Clark Kimberling_
%E A027304 More terms from _Sean A. Irvine_, Oct 26 2019