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A222787 Number of n X n 0..3 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..3 order 0
1, 3, 34, 5896, 1615706, 8113737592, 39461160617203, 3271351045573714833, 264112864034567015904268 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A222794

LINKS

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

EXAMPLE

Some solutions for n=3

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

..0..0..1....0..0..1....0..0..1....2..3..3....2..1..1....1..2..2....0..0..0

..0..0..2....2..0..0....1..0..0....3..3..3....1..1..1....2..2..2....1..0..2

CROSSREFS

Sequence in context: A194891 A194892 A182382 * A180126 A214854 A054287

Adjacent sequences:  A222784 A222785 A222786 * A222788 A222789 A222790

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 05 2013

STATUS

approved

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Last modified July 6 09:32 EDT 2022. Contains 355108 sequences. (Running on oeis4.)