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A210782
Number of nX2 1..4 arrays with no element with value z exactly a city block distance of z from another element with value z
1
15, 176, 1533, 8824, 40038, 167910, 710895, 3139374, 14621105, 73775740, 381369393, 1896558198, 8898865547, 40479815828, 186751218361, 891575695494, 4361545055817, 21344723416559, 102849312863141, 487830504402191
OFFSET
1,1
COMMENTS
Column 2 of A210788
LINKS
EXAMPLE
Some solutions for n=4
..4..2....3..3....3..4....2..4....1..3....2..1....4..4....4..2....3..1....3..3
..3..3....2..1....4..1....1..3....2..2....2..4....1..2....3..2....2..2....2..1
..1..3....1..4....2..4....3..4....4..3....3..4....3..1....4..4....3..1....4..4
..2..1....4..1....1..3....1..3....1..4....4..2....1..3....4..1....4..3....4..1
CROSSREFS
Sequence in context: A184285 A120995 A024197 * A071535 A081043 A155000
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 26 2012
STATUS
approved