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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 0
1, 3, 32, 3189, 419562, 589802909, 832227066041, 12257277646565165, 179723518209287846721, 27075363282358942396191388 (list; graph; refs; listen; history; text; internal format)
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: A202806 A054780 A203323 * A134474 A096469 A106423

Adjacent sequences:  A222680 A222681 A222682 * A222684 A222685 A222686

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 28 2013

STATUS

approved

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Last modified October 16 05:24 EDT 2021. Contains 348035 sequences. (Running on oeis4.)