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A240643
Number of n X n 0..1 arrays with no element equal to the same number of vertical neighbors as horizontal neighbors, with new values 0..1 introduced in row major order
0
0, 2, 6, 18, 232, 5304, 227270, 18030130, 2764522654, 770199142784
OFFSET
1,2
COMMENTS
Diagonal of A240649
EXAMPLE
Some solutions for n=4
..0..0..0..1....0..0..0..0....0..1..0..1....0..0..0..0....0..1..1..0
..1..1..1..1....1..1..0..1....0..1..0..1....1..1..1..1....0..0..0..0
..0..1..0..1....0..0..0..1....0..1..0..1....0..0..0..0....0..0..0..0
..0..1..0..1....1..1..0..1....0..1..0..1....1..1..1..1....0..1..1..0
CROSSREFS
Sequence in context: A208456 A056743 A064535 * A262971 A253380 A128123
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 09 2014
STATUS
approved