A202711 Number of n X n 0..1 arrays with row sums equal and no column sum equal to the previous

2, 2, 38, 838, 75302, 27842760, 37121438930, 192513188823366

Offset

1,1

Comments

Column 1 of A202714

Links

Table of n, a(n) for n=1..8.

Example

Some solutions for n=5
..0..1..0..1..1....1..1..0..1..0....1..0..1..0..0....1..0..1..0..0
..1..1..0..1..0....1..1..0..1..0....0..1..0..1..0....0..1..0..0..1
..0..0..1..1..1....1..1..0..0..1....1..0..1..0..0....0..1..0..0..1
..1..0..1..0..1....0..1..1..0..1....0..1..1..0..0....0..1..1..0..0
..1..0..1..1..0....1..1..0..0..1....1..0..0..1..0....0..0..0..1..1

Crossrefs

Sequence in context: A059523 A038623 A001121 * A222668 A210246 A116567

Adjacent sequences: A202708 A202709 A202710 * A202712 A202713 A202714

Keyword

nonn

Author

R. H. Hardin Dec 23 2011

Status

approved