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A201799
Number of zero-sum nX4 -2..2 arrays with every element unequal to at most two horizontal and vertical neighbors
0
85, 3617, 48335, 988589, 20960485, 472565771, 10857153407, 253641348337, 5979418257253, 142075597768273, 3395164032578079, 81529069984570623, 1965470518289395959
OFFSET
1,1
COMMENTS
Column 4 of A201803
EXAMPLE
Some solutions for n=3
..0.-1..1..0...-2..1..1..0...-2.-2.-1.-1...-1..1.-2..1...-1..2.-2.-2
..0.-1..1..1...-2..1..1..1....2..2..0..0....1..1.-2..1....2..2..0..0
..0.-1..1.-1...-2..1..0..0...-1..2..0..1....0..0.-2..2...-2..0..0..1
CROSSREFS
Sequence in context: A281162 A339198 A017801 * A017748 A158796 A201796
KEYWORD
nonn
AUTHOR
R. H. Hardin Dec 05 2011
STATUS
approved