%I
%S 1,1,1,1,1,1,1,1,1,3628800,1,0,0,0,0,0,0,0,0,1216451004088320000,
%T 106661318400,1,0,0,0,0,0,0,0,44208809968698509772718080000000,
%U 1320509264105545113600000,10178348544000,1,0,0,0,0,0,0
%N a(n) = floor[ n!/(R(n))! ], where R(n) = Digit reversal of n (A004086).
%C If n < R(n) then a(n) =0, n is a palindrome a(n) = 1 and for n > R(n) n!/(R(n)! = an integer.
%e a(21) = 21! / 12! = 51090942171709440000/479001600 = 106661318400.
%K base,easy,nonn
%O 1,10
%A _Amarnath Murthy_, Feb 24 2002
