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 A079205 #7 Jul 10 2011 18:42:32 %S A079205 0,2,0,0,2,0,0,0,0,2,0,29,0,237,4374 %N A079205 Number of isomorphism classes of non-associative non-commutative anti-associative anti-commutative closed binary operations on a set of order n, listed by class size. %C A079205 A079202(n)+A079203(n)+A079204(n)+A079205(n)+A079197(n)+A079207(n)+A079208(n)+A079209(n)+A063524(n)=A079171(n) %C A079205 Elements per row: 1,2,4,8,16,30,... (given by A027423, number of positive divisors of n!) %C A079205 First four rows: 0; 2,0; 0,2,0,0; 0,0,2,0,29,0,237,4374 %C A079205 A079236(x) is equal to the sum of the products of each element in row x of this sequence and the corresponding element of A079210. %C A079205 The sum of each row x of this sequence is given by A079237(x). %H A079205 C. van den Bosch, <a href="http://cosmos.ucc.ie/~cjvdb1/html/binops.shtml">Closed binary operations on small sets</a> %H A079205 <a href="/index/Gre#groupoids">Index entries for sequences related to groupoids</a> %Y A079205 Cf. A079202, A079203, A079204, A079197, A079207, A079208, A079209, A079236, A079237. %K A079205 nonn,tabf %O A079205 1,2 %A A079205 Christian van den Bosch (cjb(AT)cjb.ie), Jan 03 2003