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A202046
Number of zero-sum nX7 -1..1 arrays with every element unequal to at most two horizontal and vertical neighbors
0
393, 37311, 1067983, 49553277, 2229078023, 108356007319
OFFSET
1,1
COMMENTS
Column 7 of A202047
EXAMPLE
Some solutions for n=2
..1.-1.-1..1.-1.-1..1...-1.-1..1.-1..1..0.-1....0.-1.-1..0..1.-1.-1
.-1..1..1..1..1.-1.-1....0..0..1.-1..1..0..1....1..1..0..0..1..1.-1
CROSSREFS
Sequence in context: A201815 A201554 A172636 * A172737 A172813 A172872
KEYWORD
nonn
AUTHOR
R. H. Hardin Dec 10 2011
STATUS
approved