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 A131978 #3 Mar 30 2012 18:39:45 %S A131978 1,1,1,4,4,24,24,192,1728,17280,17280,207360,207360,414720,6220800, %T A131978 99532800,696729600,12541132800,12541132800,250822656000, %U A131978 5267275776000,10534551552000,10534551552000,252829237248000,1264146186240000,12641461862400000,3754514173132800000 %N A131978 A049614(n)/A131685(n). %C A131978 Conjectured to be always integral. %C A131978 It appears that every term > 4 is divisible by 3 - _Alexander R. Povolotsky_, Oct 18 2007 %K A131978 nonn %O A131978 1,4 %A A131978 _Alexander R. Povolotsky_, Sep 21 2007