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A210783
Number of nX3 1..4 arrays with no element with value z exactly a city block distance of z from another element with value z
1
53, 1533, 21379, 142627, 748627, 3846906, 23759000, 197838865, 1811137986, 15107056679, 115124207482, 786166311691, 5501528161561, 40508050305846, 318512137465444, 2493337048435362, 19390930320063991, 143007988520740490
OFFSET
1,1
COMMENTS
Column 3 of A210788
LINKS
EXAMPLE
Some solutions for n=4
..4..3..1....2..3..4....1..2..2....1..3..1....2..4..4....2..3..3....4..2..4
..2..1..3....3..4..2....3..1..4....4..1..2....2..3..4....2..1..3....1..2..1
..1..3..1....1..3..4....4..3..4....4..3..2....3..4..2....4..4..1....3..4..3
..3..1..2....4..1..3....1..2..3....1..4..3....1..3..1....3..2..2....4..3..4
CROSSREFS
Sequence in context: A017716 A180365 A282931 * A221237 A059694 A263516
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 26 2012
STATUS
approved