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 A027126 #7 Oct 23 2019 22:08:54 %S A027126 1,2,7,24,81,274,923,3087,10232,33587,109190,351730,1123465,3561045, %T A027126 11210036,35073033,109137568,337969627,1042129366,3201226811, %U A027126 9800475386,29914121676,91063951213,276556071836,838101477953 %N A027126 a(n) = A027113(n, 2n-8). %K A027126 nonn %O A027126 4,2 %A A027126 _Clark Kimberling_