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A201846
Number of zero-sum nX7 -1..1 arrays with every element equal to at least one horizontal or vertical neighbor
0
7, 8741, 2809217, 1459651671, 697824874477, 350714115254871
OFFSET
1,1
COMMENTS
Column 7 of A201847
EXAMPLE
Some solutions for n=2
..1..1..1.-1.-1..1..0....1..0.-1.-1..1.-1.-1...-1..0..1..1..1..0..0
.-1.-1..1.-1.-1..1..0....1..0.-1.-1..1..1..1...-1..0.-1.-1.-1..1..1
CROSSREFS
Sequence in context: A247822 A247823 A234626 * A116631 A212937 A074489
KEYWORD
nonn
AUTHOR
R. H. Hardin Dec 06 2011
STATUS
approved