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 A058104 #13 Jul 09 2025 01:40:09 %S A058104 1,1,3,15,112,1221,19684,1458882,3667253972,105923135799007 %N A058104 Number of asymmetric semigroups of order n. %H A058104 A. Distler and T. Kelsey, <a href="http://arxiv.org/abs/1301.6023">The semigroups of order 9 and their automorphism groups</a>, arXiv preprint arXiv:1301.6023 [math.CO], 2013. %H A058104 <a href="/index/Se#semigroups">Index entries for sequences related to semigroups</a> %F A058104 a(n) = A079175(n, A027423(n)). %Y A058104 Cf. A027851, A058113, A079175. %K A058104 nonn,hard %O A058104 0,3 %A A058104 _Christian G. Bower_, Nov 09 2000 %E A058104 Updated Feb 19 2001 %E A058104 a(8)-a(9) added from the Distler-Kelsey reference by _Andrew Howroyd_, Jan 26 2022