%I A077435
%S A077435 1,4,44,200,596,1444,2960,5520,9496,15332,23596,34936,50020,69732,94816,
%T A077435 126176,164960,212372,269620,337960,418716,513444,623736,751152,897776,
%U A077435 1065220,1255460,1470680
%N A077435 Number of right triangles whose vertices are lattice points in {1,2,...,
               n} X {1,2,...,n}.
%e A077435 For n=2 the right triangles are
%e A077435 ... * * . * * . * .. and .. *
%e A077435 ... * ..... * . * * ..... * *
%e A077435 so a(2)=4.
%Y A077435 Sequence in context: A071125 A053314 A051223 this_sequence A074751 A129551 
               A081078
%Y A077435 Adjacent sequences: A077432 A077433 A077434 this_sequence A077436 A077437 
               A077438
%K A077435 nonn
%O A077435 1,2
%A A077435 John W. Layman (layman(AT)math.vt.edu), Nov 30 2002