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 A058105 #12 Jan 26 2022 14:20:13 %S A058105 1,1,3,9,39,201,1258,10013,142755 %N A058105 Number of commutative asymmetric semigroups of order n. %H A058105 <a href="/index/Se#semigroups">Index entries for sequences related to semigroups</a> %F A058105 a(n) = A079201(n, A027423(n)). %Y A058105 Cf. A001426, A079201. %K A058105 nonn,hard %O A058105 0,3 %A A058105 _Christian G. Bower_, Nov 09 2000 %E A058105 Updated Feb 19 2001. %E A058105 a(7) corrected Dec 26 2006 %E A058105 a(8) from _Andrew Howroyd_, Jan 26 2022