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A208315
Number of n X n 0..2 arrays with new values 0..2 introduced in row major order and no element equal to more than two of its immediate leftward or upward or left-upward diagonal neighbors.
1
1, 13, 2852, 5269968, 82063614224, 10768439015566880, 11907389879137262727680, 110953732239793838864921644288, 8712219181636799263542546576017159296, 5764706550248813633923105729304227646191895040
OFFSET
1,2
COMMENTS
Diagonal of A208322.
LINKS
EXAMPLE
Some solutions for n=4
..0..1..0..2....0..0..0..1....0..1..2..1....0..0..1..1....0..0..0..1
..1..2..2..1....2..1..0..2....2..2..1..2....2..1..0..1....2..0..1..0
..1..0..1..1....2..0..0..2....0..2..2..2....1..2..2..2....0..2..1..1
..0..0..2..0....1..0..1..2....0..0..2..1....1..0..0..0....2..0..0..1
CROSSREFS
Cf. A208322.
Sequence in context: A203692 A187592 A287036 * A296174 A220642 A260982
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 25 2012
STATUS
approved