A224120 Number of idempotent 6X6 0..n matrices of rank 4

12405, 260235, 2273505, 12775065, 52968495, 178881705, 514370175, 1311704565, 3033506835, 6484756785

Offset

1,1

Comments

Row 6 of A224118

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Sequence in context: A061731 A278892 A248084 * A233964 A156116 A068676

Adjacent sequences: A224117 A224118 A224119 * A224121 A224122 A224123

Keyword

nonn

Author

R. H. Hardin Apr 09 2013

Status

approved