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 A079195 #10 Jan 26 2022 23:09:05
%S A079195 0,0,2,666,1047436,30517547395,21936950639192784,
%T A079195 459986536544739894613595,324518553658426726783148869733112
%N A079195 Number of non-associative commutative closed binary operations on a set of order n.
%H A079195 C. 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 A079195 <a href="/index/Gre#groupoids">Index entries for sequences related to groupoids</a>
%F A079195 A079192(n) + a(n) + A079198(n) + A023815(n) = A002489(n).
%F A079195 a(n) = Sum_{k>=1} A079197(n,k)*A079210(n,k).
%F A079195 a(n) = A023813(n) - A023815(n). - _Andrew Howroyd_, Jan 26 2022
%Y A079195 Cf. A023813, A023815, A079192, A079196 (isomorphism classes), A079197, A079198.
%K A079195 nonn
%O A079195 0,3
%A A079195 Christian van den Bosch (cjb(AT)cjb.ie), Jan 03 2003
%E A079195 a(0)=0 prepended and a(5)-a(8) added by _Andrew Howroyd_, Jan 26 2022