A222282 Number of n X n 0..1 arrays with exactly floor(n X n/2) elements unequal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..1 order

1, 0, 4, 208, 6582, 1249354, 262048125, 288902941734, 350421368609396

Offset

1,3

Comments

Diagonal of A222290

Links

Table of n, a(n) for n=1..9.

Example

Some solutions for n=4
..0..0..0..1....0..0..0..0....0..0..1..1....0..0..0..1....0..0..0..0
..0..0..1..1....0..0..0..0....0..1..1..1....0..0..0..1....0..0..1..0
..0..0..1..1....0..0..1..0....0..0..1..1....0..0..1..1....0..0..0..1
..0..1..1..1....0..1..1..0....0..0..1..1....0..0..1..1....0..0..0..1

Crossrefs

Sequence in context: A129465 A300152 A260639 * A087924 A201978 A081787

Adjacent sequences: A222279 A222280 A222281 * A222283 A222284 A222285

Keyword

nonn

Author

R. H. Hardin Feb 14 2013

Status

approved