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 A127564 #6 Apr 09 2014 10:12:25
%S A127564 1,2,6,36,144,1152,13824,248832,2488320,39813120,796262400,
%T A127564 19906560000,378224640000,10212065280000,91908587520000,
%U A127564 3308709150720000,79409019617280000,2382270588518400000,35734058827776000000
%N A127564 a(n) = product{k=1 to n} A127562(k).
%C A127564 a(n) is divisible by A127563(n).
%Y A127564 Cf. A127562, A127563.
%K A127564 nonn
%O A127564 1,2
%A A127564 _Leroy Quet_, Jan 18 2007
%E A127564 Extended by _Ray Chandler_, Jan 22 2007