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 A086803 #4 Oct 01 2013 17:57:42
%S A086803 1,6,40,1728,10560,604800,4386816,348364800,76859228160,490311843840,
%T A086803 172454510592000,6951148594790400,54188395462656000,
%U A086803 5673488083845120000,2112698895984230400000,458667310457770160947200
%N A086803 a(n) = Product_{i=2..n} (prime(n+1)-prime(i)).
%F A086803 (3-2)=1, (5-2)*(5-3)=6, (7-2)*(7-3)*(7-5)=40, ...
%o A086803 (PARI) fnpr(n)=forprime(x=3,n,pr=1; forprime(y=2,x-1,pr=pr*(x-y)); print1(pr","))
%K A086803 easy,nonn
%O A086803 1,2
%A A086803 _Cino Hilliard_, Aug 05 2003