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A202032
Number of nX7 zero-sum -1..1 arrays with rows and columns lexicographically nondecreasing
0
4, 555, 207562, 108479344, 54711391946, 23770010642604, 8770728360813539, 2783263135495226169, 772297911415160439452, 190197136552795434910476
OFFSET
1,1
COMMENTS
Column 7 of A202033
EXAMPLE
Some solutions for n=2
.-1.-1.-1.-1..0..0..1...-1.-1.-1..0..1..1..1...-1..0..0..0..0..0..1
..0..1..1..1.-1..0..1....0..0..1.-1..0..0..0....0.-1..0..0..0..1..0
CROSSREFS
Sequence in context: A159367 A012770 A332154 * A267066 A159530 A274470
KEYWORD
nonn
AUTHOR
R. H. Hardin Dec 09 2011
STATUS
approved