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 A058132 #15 Oct 27 2019 14:27:37 %S A058132 0,1,2,5,19,84,509,3901,48957 %N A058132 Number of self-converse monoids (semigroups with identity) of order n. %H A058132 <a href="/index/Mo#monoids">Index entries for sequences related to monoids</a> %F A058132 a(n) = A058133(n)*2 - A058129(n). %Y A058132 Cf. A058129, A058133. %K A058132 nonn,more %O A058132 0,3 %A A058132 _Christian G. Bower_, Nov 13 2000 %E A058132 a(8) from _Max Alekseyev_, Jul 13 2009 %E A058132 a(0) prepended by _Jianing Song_, Oct 26 2019