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A201802 Number of zero-sum nX7 -2..2 arrays with every element unequal to at most two horizontal and vertical neighbors 0
8135, 1972115, 90062519, 10857153407, 1077779765471 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A201803

LINKS

Table of n, a(n) for n=1..5.

EXAMPLE

Some solutions for n=2

.-2.-2.-2..1..1..2..0...-2.-2..2..2.-1.-1.-1...-2.-2.-1.-1.-1..2..0

..1..1.-2.-2..1..2..1....1.-2..2..1..1..0..0....1..1..0..0..2..2.-1

CROSSREFS

Sequence in context: A082919 A217222 A252144 * A233814 A190835 A013689

Adjacent sequences:  A201799 A201800 A201801 * A201803 A201804 A201805

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 05 2011

STATUS

approved

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Last modified July 28 22:53 EDT 2021. Contains 346339 sequences. (Running on oeis4.)