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A222899 Number of n X n 0..3 arrays with no more than 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, 4, 45, 7794, 2117424, 10615237672, 51666240687220, 4291633334520814783, 347033965049827951084160 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A222906

LINKS

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

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A189273 A288554 A288562 * A119729 A134110 A176312

Adjacent sequences:  A222896 A222897 A222898 * A222900 A222901 A222902

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 09 2013

STATUS

approved

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Last modified July 12 18:03 EDT 2020. Contains 335666 sequences. (Running on oeis4.)