A202648 Number of n X n 0..1 arrays with no row or column sum equal to the previous

2, 8, 126, 10016, 3648810, 5616280768, 35610018145138

Offset

1,1

Comments

Column 1 of A202651

Links

Table of n, a(n) for n=1..7.

Example

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

Crossrefs

Sequence in context: A358152 A271846 A009360 * A193481 A156497 A064205

Adjacent sequences: A202645 A202646 A202647 * A202649 A202650 A202651

Keyword

nonn

Author

R. H. Hardin Dec 22 2011

Status

approved