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A209366
Number of n X n 1..3 arrays with no element with value z exactly a city block distance of z from another element with value z
0
3, 39, 115, 968, 19434, 677448, 43249360, 5008603698, 1040887695040, 390290619582728, 263701318486632444, 321337793316358945352, 705783458367197689313992
OFFSET
1,1
COMMENTS
Diagonal of A209374
EXAMPLE
Some solutions for n=5
..3..1..2..1..3....2..2..3..1..2....2..2..3..1..3....1..3..1..2..2
..1..3..1..3..2....1..3..1..3..2....1..3..1..3..1....2..1..3..1..3
..2..2..3..1..3....3..1..2..1..3....3..1..2..2..3....2..3..1..3..1
..1..3..1..2..1....1..3..1..3..1....1..3..1..3..1....3..1..3..1..3
..3..1..3..2..3....2..2..3..1..2....3..1..3..1..3....1..2..2..3..1
CROSSREFS
Sequence in context: A134106 A153875 A082954 * A292542 A212664 A342969
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 07 2012
STATUS
approved