%I #5 Feb 14 2018 21:12:54
%S 0,1,718,620448401733239439359280
%N f(f(n+1))-f(f(n)), where f(m) = m! = A000142(m).
%K nonn
%O 0,3
%A _N. J. A. Sloane_, Nov 12 2005
%E ~Definition corrected by _N. J. A. Sloane_, Feb 14 2018
