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 A027130 #8 Oct 23 2019 21:56:23
%S A027130 1,4,13,40,119,350,1022,2973,8635,25074,72850,211875,616985,1799092,
%T A027130 5253127,15358500,44958889,131759776,386557548,1135204289,3336791503,
%U A027130 9816315842,28900431835,85147344488,251030187583,740539502786
%N A027130 a(n) = Sum_{0<=j<=i<=n} A027113(i, n+j).
%Y A027130 Partial sums of A027129.
%K A027130 nonn
%O A027130 0,2
%A A027130 _Clark Kimberling_
%E A027130 Title corrected by _Sean A. Irvine_, Oct 23 2019