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 A027094 #7 Oct 23 2019 17:32:45 %S A027094 1,3,9,31,105,352,1168,3828,12396,39698,125878,395686,1234426,3825911, %T A027094 11790893,36160491,110429221,336001043,1019092233,3082348295, %U A027094 9300339633,28002492673,84156758459,252507279805,756547966323 %N A027094 a(n) = A027082(n, 2n-7). %K A027094 nonn %O A027094 4,2 %A A027094 _Clark Kimberling_