A224116 Number of idempotent 5X5 0..n matrices of rank 2.

3070, 30410, 136990, 467290, 1240310, 2986210, 6260470, 12345410, 22576030, 39299170, 64929590, 104218930, 160450990, 240932330, 352487350

Offset

1,1

Links

Table of n, a(n) for n=1..15.

Example

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

Crossrefs

Row 5 of A224114.

Sequence in context: A274410 A274411 A224970 * A183726 A137485 A251786

Adjacent sequences: A224113 A224114 A224115 * A224117 A224118 A224119

Keyword

nonn,more

Author

R. H. Hardin, Apr 09 2013

Status

approved