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 A079202 #6 Jul 10 2011 18:42:31 %S A079202 0,0,0,0,0,32,2155,0,0,0,12,60,184,34544,147032271 %N A079202 Number of isomorphism classes of non-associative non-commutative non-anti-associative non-anti-commutative closed binary operations on a set of order n, listed by class size. %C A079202 A079202(n)+A079203(n)+A079204(n)+A079205(n)+A079197(n)+A079207(n)+A079208(n)+A079209(n)+A063524(n)=A079171(n) %C A079202 Elements per row: 1,2,4,8,16,30,... (given by A027423, number of positive divisors of n!) %C A079202 First four rows: 0; 0,0; 0,0,32,2155; 0,0,0,12,60,184,34544,147032271 %C A079202 A079230(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 A079202 The sum of each row x of this sequence is given by A079231(x). %H A079202 C. van den Bosch, <a href="http://cosmos.ucc.ie/~cjvdb1/html/binops.shtml">Closed binary operations on small sets</a> %H A079202 <a href="/index/Gre#groupoids">Index entries for sequences related to groupoids</a> %Y A079202 Cf. A079203, A079204, A079205, A079197, A079207, A079208, A079209, A079230, A079231. %K A079202 nonn,tabf %O A079202 1,6 %A A079202 Christian van den Bosch (cjb(AT)cjb.ie), Jan 03 2003