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A209180
Number of n X 2 1..6 arrays with no element with value z exactly a city block distance of z from another element with value z.
0
35, 1104, 31185, 782336, 17015665, 311027162, 5208624406, 85171286099
OFFSET
1,1
COMMENTS
Column 2 of A209182.
EXAMPLE
Some solutions for n=6
..3..5....4..4....6..3....6..6....2..6....5..6....6..4....3..1....5..1....3..3
..4..1....6..4....5..3....1..4....5..5....6..4....2..6....2..3....2..3....5..6
..5..5....4..6....1..6....2..6....5..5....4..5....4..6....4..6....4..6....1..2
..2..4....1..5....6..4....6..1....5..4....2..6....6..4....5..1....4..3....4..4
..6..5....2..5....4..1....1..5....2..3....5..3....6..6....3..5....3..6....4..3
..3..3....6..1....6..2....4..2....2..6....3..2....4..2....6..5....1..3....3..6
CROSSREFS
Cf. A209182.
Sequence in context: A049395 A278723 A215296 * A115492 A187538 A306685
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 05 2012
STATUS
approved