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A210786
Number of nX6 1..4 arrays with no element with value z exactly a city block distance of z from another element with value z
0
1407, 167910, 3846906, 69751928, 1663213556, 51104966068, 1928958791380, 72641549339434, 2458594514534208
OFFSET
1,1
COMMENTS
Column 6 of A210788
EXAMPLE
Some solutions for n=4
..1..2..1..3..1..3....1..2..1..3..1..2....1..4..3..3..3..1....2..2..3..4..1..4
..4..1..3..1..2..4....3..4..3..2..4..1....2..2..1..4..1..2....1..3..3..1..4..1
..2..4..1..3..1..3....1..3..4..4..1..3....3..4..4..1..4..1....4..1..4..2..1..3
..3..4..3..1..3..1....3..4..3..1..2..1....3..3..1..4..1..3....1..4..1..2..3..1
CROSSREFS
Sequence in context: A158764 A035863 A045127 * A187957 A235906 A364184
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 26 2012
STATUS
approved