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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A210788

LINKS

Table of n, a(n) for n=1..6.

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: A034599 A222783 A107540 * A232430 A163111 A045247

Adjacent sequences:  A210784 A210785 A210786 * A210788 A210789 A210790

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 26 2012

STATUS

approved

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Last modified December 6 22:42 EST 2021. Contains 349567 sequences. (Running on oeis4.)