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 A027095 #7 Oct 23 2019 17:32:56 %S A027095 1,1,5,17,57,193,650,2173,7199,23619,76746,247103,788934,2499707, %T A027095 7866233,24603551,76538239,236960031,730506849,2243545795,6867375720, %U A027095 20958167581,63791696431,193708118293,586967142587,1775245686845 %N A027095 a(n) = A027082(n, 2n-8). %K A027095 nonn %O A027095 4,3 %A A027095 _Clark Kimberling_