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A197538
Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 2,2,1,1,1 for x=0,1,2,3,4
0
1, 5, 11, 131, 494, 12019, 223832, 9712913, 396593739, 39500650780
OFFSET
1,2
COMMENTS
Every 0 is next to 0 2's, every 1 is next to 1 2's, every 2 is next to 2 1's, every 3 is next to 3 1's, every 4 is next to 4 1's
Diagonal of A197545
EXAMPLE
Some solutions for n=4
..0..1..2..1....0..0..0..1....2..1..0..1....1..2..2..1....2..1..1..2
..0..1..2..1....0..0..1..2....1..0..1..2....0..1..1..0....1..3..0..1
..1..3..2..1....1..3..1..2....1..3..1..2....1..3..0..0....3..1..1..3
..2..1..1..0....2..1..0..1....2..1..0..1....2..1..0..0....1..2..2..1
CROSSREFS
Sequence in context: A328445 A094108 A222674 * A083418 A266527 A267078
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 16 2011
STATUS
approved