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A269142
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Number of nX7 0..3 arrays with some element plus some horizontally, antidiagonally or vertically adjacent neighbor totalling three no more than once.
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1
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8748, 2727564, 732561916, 186315931804, 45920055321732, 11067174233536260, 2621894498331024092, 612729907775635265268, 141617828339474744759764, 32434464000726413874379876, 7371987566769862222037312812
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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=1
..1..3..3..1..1..3..2. .2..3..3..2..2..2..1. .2..2..3..1..0..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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