A267660 Number of n X n 0..1 arrays with every repeated value in every row unequal to the previous repeated value, and in every column equal to the previous repeated value, and new values introduced in row-major sequential order.

1, 8, 108, 3143, 80404, 5663798, 264709135, 46354321490, 3947286385526, 1938755845909663

Offset

1,2

Comments

Diagonal of A267667.

Links

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

Example

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

Crossrefs

Cf. A267667.

Sequence in context: A099699 A084915 A138456 * A273057 A095917 A259233

Adjacent sequences: A267657 A267658 A267659 * A267661 A267662 A267663

Keyword

nonn

Author

R. H. Hardin, Jan 19 2016

Status

approved