A224115 Number of idempotent 4X4 0..n matrices of rank 2.

282, 1434, 4182, 9762, 19110, 34602, 56982, 89766, 134298, 194262, 271074, 371478, 494346, 647358, 833226, 1057542, 1321482, 1636314, 1999926, 2425794, 2913678, 3472242, 4104942, 4828626

Offset: 1

Author

R. H. Hardin, Apr 09 2013

Keywords

• nonn
• more

Examples

			Some solutions for n=3
..0..0..0..0....1..0..0..0....0..0..0..0....0..0..0..0....1..0..0..0
..1..1..0..0....0..1..1..0....1..1..0..0....1..1..0..0....0..1..0..0
..2..1..0..1....0..0..0..0....0..0..1..0....1..1..0..1....2..2..0..0
..1..0..0..1....0..3..3..0....0..0..1..0....0..0..0..1....0..3..0..0
		

Crossrefs

Row 4 of A224114.