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%I #4 Apr 09 2013 17:12:21
%S 10,26,42,58,74,106,122,138,154,186,202,234,250,282,314,330,346,378,
%T 394,426,458,490,506,538,554,586,602,634,650,714,730,746,778,810,842,
%U 874,890,922,954,986,1002,1066,1082,1114,1146,1178,1194,1226,1242,1274,1306,1338
%N Number of idempotent 2X2 -n..n matrices of rank 1
%C Row 2 of A223450
%H R. H. Hardin, <a href="/A223451/b223451.txt">Table of n, a(n) for n = 1..210</a>
%e Some solutions for n=3
%e .-2..2....1..0....1.-1....1.-3....0.-1....3.-2...-1.-2....0..0....1..3....2..1
%e .-3..3...-1..0....0..0....0..0....0..1....3.-2....1..2....1..1....0..0...-2.-1
%K nonn
%O 1,1
%A _R. H. Hardin_ Apr 09 2013
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