A222683 Number of n X n 0..2 arrays with exactly floor(n X n/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..2 order

1, 3, 32, 3189, 419562, 589802909, 832227066041, 12257277646565165, 179723518209287846721, 27075363282358942396191388

Offset

1,2

Comments

Diagonal of A222690

Links

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

Example

Some solutions for n=3
..0..0..0....0..0..0....0..0..0....0..0..1....0..1..0....0..0..1....0..1..2
..0..0..0....0..0..1....0..0..0....0..1..1....1..1..1....1..0..0....1..1..1
..1..2..2....2..1..1....1..0..2....1..1..1....1..1..1....0..0..0....1..1..1

Crossrefs

Sequence in context: A054780 A203323 A367565 * A134474 A096469 A106423

Adjacent sequences: A222680 A222681 A222682 * A222684 A222685 A222686

Keyword

nonn

Author

R. H. Hardin Feb 28 2013

Status

approved