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%I #4 Apr 10 2013 07:53:04
%S 87,447,999,1935,2871,5079,6399,8679,10971,14667,16755,22323,24795,
%T 29979,35643,41019,44259,53139,56763,66123,74043,82203,86595,100035,
%U 106755,116403,125091,138243,143787,165627,171555,183867,196347,208971,222267
%N Number of idempotent 3X3 -n..n matrices of rank 1
%C Row 3 of A221311
%H R. H. Hardin, <a href="/A221312/b221312.txt">Table of n, a(n) for n = 1..42</a>
%e Some solutions for n=3
%e .-1.-1.-1....0..0..0....0..0..0....0..3..3...-1.-2..0....0..2..2....3.-2..0
%e ..3..3..3...-2..1..3...-1.-2.-3....0..2..2....1..2..0....0..2..2....3.-2..0
%e .-1.-1.-1....0..0..0....1..2..3....0.-1.-1....0..0..0....0.-1.-1....3.-2..0
%K nonn
%O 1,1
%A _R. H. Hardin_ Apr 10 2013
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