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 A118747 #3 Mar 30 2012 18:40:37 %S A118747 2,6,30,210,1470,16170,210210,2732730,46456410,882671790,16770764010, %T A118747 385727572230,8871734161290,204049885709670,5917446685580430, %U A118747 183440847252993330,5686666264842793230,176286654210126590130 %N A118747 a(n) = product[k=1..n] P(k), where P(k) is the largest prime <= 2*k. a(n) = product[k=1..n] A060308(k). %Y A118747 Cf. A020482, A049653, A060266-A060268, A060264, A060265, A060308, A118455, A118456, A118748. %K A118747 easy,nonn %O A118747 1,1 %A A118747 _Jonathan Vos Post_, Apr 29 2006