%I A119867
%S A119867 1,6,14,25,40,57,79,103,132,165,201,239,283,329,379,434,493,554,620,688,
%T A119867 762,839,918,1000,1089,1182,1277,1376,1480,1586,1698,1811,1930,2051,
%U A119867 2175,2306,2441
%N A119867 Number of different values assumed by a*b+c*d as a,b,c,d range between 
               1 and n.
%e A119867 a(2)=6 since we can obtain 6 values, i.e., {2, 3, 4, 5, 6, 8}.
%t A119867 Table[Length@Union@Flatten@Table[a*b + c*d, {a,n}, {b,n}, {c,n}, {d,n}], 
               {n,24}]
%Y A119867 Cf. A119868.
%Y A119867 Sequence in context: A083657 A010740 A095794 this_sequence A026055 A165986 
               A131951
%Y A119867 Adjacent sequences: A119864 A119865 A119866 this_sequence A119868 A119869 
               A119870
%K A119867 nonn
%O A119867 1,2
%A A119867 Giovanni Resta (g.resta(AT)iit.cnr.it), May 26 2006