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 A027092 #7 Oct 23 2019 17:17:29 %S A027092 1,3,9,31,102,328,1035,3217,9880,30062,90803,272697,815228,2428298, %T A027092 7212179,21370921,63207913,186668355,550617011,1622604097,4777983482, %U A027092 14060981252,41360234037,121616984851,357510486913,1050750138523 %N A027092 a(n) = A027082(n, 2n-5). %K A027092 nonn %O A027092 3,2 %A A027092 _Clark Kimberling_