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A201797
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Number of zero-sum nX2 -2..2 arrays with every element unequal to at most two horizontal and vertical neighbors
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1
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5, 85, 455, 3617, 28625, 235827, 1972115, 16703881, 142672901, 1226999941, 10610923603, 92180196507, 803840798219, 7032319990027, 61691173120353, 542479698511869, 4780243712781261, 42200307665852185, 373156481784589911
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OFFSET
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1,1
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for n=5
..2.-1...-2..2...-2..2...-1..2...-2..1....1..2....2..2....0..0....0..0...-1.-2
..2.-1...-2..0....1..1...-1..2....2.-1...-2.-2...-2.-2....2..2....2.-1...-1.-2
..0..0...-2..0....0..0....1.-2....2.-1....2.-2....2..0....0..0....2.-1....2..0
..0..0....2..2...-1.-1....1.-2...-2.-2....2.-2....2..0....0.-1...-1.-1....2..0
..0.-2....1.-1....2.-2....2.-2....1..2....2.-1...-2.-2...-2.-1...-1..1....0..2
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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