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 A140700 #6 Mar 31 2012 20:38:30 %S A140700 1,-2,-3,0,-5,6,-7,0,0,10,-11,0,-13,14,15,0,-17,0,-19,0,21,22,-23,0,0, %T A140700 26,0,0,-29,30,-31,0,33,34,35,0,-37,38,39,0,-41,42,-43,0,0,46,-47,0 %N A140700 Row products of A140699. %C A140700 Primes have negative signs in a(n). Differs from A055615 at a(30) = 30. %Y A140700 Cf. A140699, A054524, A140256, A055615. %K A140700 sign %O A140700 1,2 %A A140700 Mats O. Granvik and _Gary W. Adamson_, May 24 2008