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 A066631 #7 Jun 24 2014 01:08:19
%S A066631 4,8,24,120,840,9240,120120,2042040,38798760,1202761560,34880085240,
%T A066631 802241960520,32891920381320,1414352576396760,52331045326680120,
%U A066631 4657463034074530680,274790319010397310120,14563886907551057436360
%N A066631 The sequence f(1), f(2), ... as defined in A068192.
%o A066631 (PARI) {a=4; for(n=1,18,print1(a,","); b=a-precprime(a-2); a=a*b)}
%Y A066631 Cf. A068192.
%K A066631 nonn
%O A066631 1,1
%A A066631 _N. J. A. Sloane_, Jun 10 2002
%E A066631 Edited by _Dean Hickerson_ and _Klaus Brockhaus_, Jun 10 2002