%I #4 Mar 30 2012 17:20:41
%S 0,0,0,1,5,15,35,69,125,205,325,479,699,965,1325,1745,2305,2919,3735,
%T 4619,5739,6949,8489,10061,12081,14161,16705,19343,22619,25819,29879,
%U 33919,38759,43655,49615,55325,62465,69419,77635,85771,95651,104895
%N Quadruples of different integers from [ 1,n ] with no global factor.
%K nonn
%O 1,5
%A _Olivier GĂ©rard_