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 A090596 #25 Jun 19 2020 04:06:52 %S A090596 1,1,2,3,7,12,24,45,91,176,352,693,1387,2752,5504,10965,21931,43776, %T A090596 87552,174933,349867,699392,1398784,2796885,5593771,11186176,22372352, %U A090596 44741973,89483947,178962432,357924864,715838805,1431677611,2863333376,5726666752 %N A090596 Duplicate of A018240. %K A090596 dead %O A090596 3,3