%I #5 Mar 28 2015 06:32:53
%S 1,1,1,120,30,12,6,24,15,10,1,8,6,60,30,24,3,3,5,40,2,12,6,120,15,6,3,
%T 8,10,20,6,24,3,15,15,24,2,4,10,120,3,6,3,120,30,4,2,8,15,15,3,24,6,
%U 60,10,8,1,6,15,120,6,12,6,40,5,1,3,24,30,60,6,24,1,10
%N Denominator of n(n-1)(n-2)/720.
%D R. L. Graham, D. E. Knuth and O. Patashnik, Concrete Mathematics. Addison-Wesley, Reading, MA, 1990, p. 269.
%Y Cf. A051726.
%K nonn,easy,frac
%O 0,4
%A _N. J. A. Sloane_