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 A058112 #10 Feb 17 2022 14:19:44 %S A058112 1,1,3,10,46,251,1682,13213,119826,1228712 %N A058112 Number of isomorphism classes of idempotent semigroups of order n. %H A058112 <a href="/index/Mo#monoids">Index entries for sequences related to monoids</a> %H A058112 <a href="/index/Se#semigroups">Index entries for sequences related to semigroups</a> %Y A058112 Main diagonal of A058108 and A058137. %Y A058112 Cf. A027851, A351730 (labeled). %K A058112 nonn,hard %O A058112 0,3 %A A058112 _Christian G. Bower_, Nov 09 2000 %E A058112 Updated Feb 19 2001 %E A058112 a(8)-a(9) added by _Andrew Howroyd_, Feb 17 2022