A267637 Number of n X n 0..1 arrays with every repeated value in every row and column unequal to the previous repeated value, and new values introduced in row-major sequential order.

1, 8, 51, 1015, 8917, 343145, 3696933, 330654951, 4301737251, 1093232460925

Offset

1,2

Comments

Diagonal of A267644.

Links

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

Example

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

Crossrefs

Cf. A267644.

Sequence in context: A348312 A295602 A226199 * A238648 A341626 A215834

Adjacent sequences: A267634 A267635 A267636 * A267638 A267639 A267640

Keyword

nonn

Author

R. H. Hardin, Jan 18 2016

Status

approved