%I #4 Mar 30 2012 17:20:41
%S 0,0,0,1,5,12,31,53,99,148,257,335,531,690,948,1192,1685,1977,2689,
%T 3171,3961,4651,5987,6716,8353,9539,11340,12781,15599,16945,20417,
%U 22705,26066,28814,33405,35980,42059,45966,51636,55816,64226,68205
%N Quadruples of different integers from [ 1,n ] with no common factors between triples.
%K nonn
%O 1,5
%A _Olivier GĂ©rard_