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 A079231 #3 Jan 24 2006 03:00:00 %S A079231 0,0,2187,147067071 %N A079231 Number of isomorphism classes of non-associative non-commutative non-anti-associative non-anti-commutative closed binary operations on a set of order n. %C A079231 A079231(n)+A079233(n)+A079235(n)+A079237(n)+A079196(n)+A079241(n)+A079243(n)+A079245(n)+A063524(n)=A002489(n) %C A079231 Each a(n) is equal to the sum of the elements in row n of A079202. %Y A079231 Cf. A079202, A079230, A079233, A079235, A079237, A079196, A079241, A079243, A079245, A063524. %K A079231 nonn %O A079231 1,3 %A A079231 Christian van den Bosch (cjb(AT)cjb.ie), Jan 03 2003