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A197744
Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 3,3,0,1,0 for x=0,1,2,3,4
0
1, 7, 66, 1317, 115795, 26488736, 16946352492, 30667098889607, 150836015759040225
OFFSET
1,2
COMMENTS
Every 0 is next to 0 3's, every 1 is next to 1 3's, every 2 is next to 2 0's, every 3 is next to 3 1's, every 4 is next to 4 0's
Diagonal of A197750
EXAMPLE
Some solutions containing all values 0 to 4 for n=4
..0..0..0..2....1..3..1..0....0..0..0..2....2..0..0..1....1..3..1..0
..1..0..4..0....0..1..0..0....1..0..4..0....0..0..1..3....0..1..0..0
..3..1..0..0....0..0..4..0....3..1..0..0....0..4..0..1....0..0..4..0
..1..0..0..2....2..0..0..2....1..0..0..0....2..0..0..0....2..0..0..0
CROSSREFS
Sequence in context: A003286 A244602 A223889 * A052351 A210476 A217095
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 17 2011
STATUS
approved