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 A058143 #10 Feb 15 2022 13:57:33 %S A058143 1,3,9,26,98,455,4018,101910,10054303 %N A058143 Number of commutative monoids of order n with 2 idempotents. %H A058143 <a href="/index/Mo#monoids">Index entries for sequences related to monoids</a> %Y A058143 Column 2 of A058142. %K A058143 nonn,more %O A058143 2,2 %A A058143 _Christian G. Bower_, Nov 14 2000 %E A058143 a(8)-a(10) from _Andrew Howroyd_, Feb 15 2022