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A210787
Number of nX7 1..4 arrays with no element with value z exactly a city block distance of z from another element with value z
0
3962, 710895, 23759000, 890122678, 37591420090, 1928958791380
OFFSET
1,1
COMMENTS
Column 7 of A210788
EXAMPLE
Some solutions for n=4
..3..4..3..1..4..1..4....3..4..2..1..3..3..1....2..2..3..3..1..2..4
..4..3..1..2..1..3..4....1..3..1..4..2..3..4....1..4..3..1..4..2..1
..3..1..3..1..3..1..2....3..2..4..1..4..4..1....4..1..4..4..1..4..3
..1..4..1..3..2..3..4....1..3..1..3..1..2..4....2..4..1..2..4..3..2
CROSSREFS
Sequence in context: A007038 A222783 A107540 * A232430 A163111 A045247
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 26 2012
STATUS
approved