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A222979
Number of n X n 0..2 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..2 order
0
1, 4, 43, 4572, 601407, 850056406, 1202086792105, 17754195762507497, 260868222546366365309, 39377828973385121921770236
OFFSET
1,2
COMMENTS
Diagonal of A222986
EXAMPLE
Some solutions for n=3
..0..1..1....0..0..1....0..0..0....0..1..1....0..0..0....0..0..1....0..0..1
..1..1..1....2..0..0....0..0..1....1..1..1....1..2..2....0..1..1....0..0..0
..1..1..2....0..0..0....0..2..2....1..1..0....2..2..2....1..1..1....0..0..0
CROSSREFS
Sequence in context: A355081 A176827 A220675 * A284192 A278798 A102388
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 11 2013
STATUS
approved