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A222449 Number of n X n 0..1 arrays with exactly floor(n X n/2) elements unequal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..1 order. 0
1, 0, 2, 101, 1847, 161779, 17977932, 8774928190, 4427986390487, 10016765131595843 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Diagonal of A222456.

LINKS

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

EXAMPLE

Some solutions for n=4

..0..0..1..1....0..0..0..0....0..0..0..0....0..0..0..0....0..1..1..1

..0..0..1..0....0..0..0..0....0..0..0..1....0..0..0..1....0..1..1..1

..0..0..0..0....1..1..0..0....0..0..0..0....1..1..1..1....1..1..1..1

..0..0..0..0....1..1..0..0....0..0..1..0....1..1..1..1....0..1..1..1

CROSSREFS

Cf. A222456.

Sequence in context: A072383 A037053 A300102 * A035325 A266457 A028989

Adjacent sequences:  A222446 A222447 A222448 * A222450 A222451 A222452

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 20 2013

STATUS

approved

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Last modified July 2 21:48 EDT 2022. Contains 355029 sequences. (Running on oeis4.)