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 A033598 #22 Feb 17 2021 10:39:28 %S A033598 1,4,9,19,35,52,72,100,131,163,201,244,290,340,393,451,515,580,648, %T A033598 724,803,883,969,1060,1154,1252,1353,1459,1571,1684,1800,1924,2051, %U A033598 2179,2313,2452,2594,2740,2889,3043,3203,3364,3528,3700,3875,4051,4233 %N A033598 Duplicate of A008084. %K A033598 dead %O A033598 0,2