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 A328746 #12 Oct 27 2019 14:34:05 %S A328746 0,1,1,1,2,5,72,12151,53146457 %N A328746 Number of loops of order n, considered to be equivalent when they are isomorphic or anti-isomorphic (by reversal of the operator). %F A328746 a(n) = (A057771(n)+A057996(n))/2. %Y A328746 For the number of group-like algebraic structures of order n, see: %Y A328746 Semigroups: A027851 or A001423 (commutative: A001426); %Y A328746 Monoids: A058129 or A058133 (commutative: A058131); %Y A328746 Quasigroups: A057991 or A058171 (commutative: A057992); %Y A328746 Loops: A057771 or this sequence (commutative: A089925); %Y A328746 Groups: A000001 (commutative: A000688); %Y A328746 Rings: A027623 or A038036 (commutative: A037289); %Y A328746 Rings with unity: A037291; %Y A328746 Fields: A069513. %K A328746 nonn,hard,more %O A328746 0,5 %A A328746 _Jianing Song_, Oct 26 2019