A224120 - OEIS

%I #3 Apr 09 2013 12:01:05

%S 12405,260235,2273505,12775065,52968495,178881705,514370175,

%T 1311704565,3033506835,6484756785

%N Number of idempotent 6X6 0..n matrices of rank 4

%C Row 6 of A224118

%e Some solutions for n=3

%e ..0..0..3..0..0..0....1..0..1..1..0..0....1..0..0..0..1..0....1..0..0..0..0..0

%e ..0..1..0..0..0..0....0..1..1..1..0..0....0..1..0..0..1..0....0..1..0..0..0..0

%e ..0..0..1..0..0..0....0..0..0..0..0..0....0..0..1..0..0..0....0..0..1..0..0..0

%e ..0..0..0..1..0..0....0..0..0..0..0..0....3..0..2..0..3..0....2..1..0..0..0..3

%e ..0..0..0..0..0..0....0..0..3..1..1..0....0..0..0..0..0..0....0..0..2..0..0..1

%e ..0..0..0..0..1..1....0..0..1..0..0..1....0..0..0..0..0..1....0..0..0..0..0..1

%K nonn

%O 1,1

%A _R. H. Hardin_ Apr 09 2013