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 A079180 #21 Sep 22 2024 18:39:13 %S A079180 1,0,2,10,17780 %N A079180 Number of isomorphism classes of anti-associative closed binary operations on a set of order n. %H A079180 Christian van den Bosch, <a href="https://web.archive.org/web/20071014230143/http://cosmos.ucc.ie/~cjvdb1/html/binops.shtml">Closed binary operations on small sets</a> %H A079180 <a href="/index/Se#semigroups">Index entries for sequences related to semigroups</a> %H A079180 <a href="/index/Gre#groupoids">Index entries for sequences related to groupoids</a> %F A079180 a(n) = A001329(n) - A079177(n). %Y A079180 Row sums of A079181. %Y A079180 Cf. A001329, A079177, A079179 (labeled case). %K A079180 nonn %O A079180 0,3 %A A079180 Christian van den Bosch (cjb(AT)cjb.ie), Jan 03 2003 %E A079180 a(0)=1 prepended and a(1) corrected by _Kamil Zabielski_, Aug 28 2024