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A303807
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Number of nX7 0..1 arrays with every element unequal to 0, 1, 3 or 4 king-move adjacent elements, with upper left element zero.
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1
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21, 127, 83, 202, 291, 597, 1217, 2767, 6147, 14940, 34846, 84947, 210191, 538910, 1368999, 3502960, 8990885, 23400795, 61220178, 160733766, 422311782, 1114702509, 2954914697, 7862464520, 20960436098, 55991586940, 149902307803
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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
..0..1..0..1..1..1..1. .0..1..1..1..0..1..0. .0..0..0..0..0..0..1
..0..0..1..1..1..1..0. .1..1..1..1..1..0..0. .0..0..0..0..0..0..0
..0..0..1..1..1..0..0. .1..1..1..1..1..0..0. .0..0..0..0..0..0..0
..0..0..1..1..0..0..0. .1..1..1..1..1..0..0. .1..0..0..0..0..0..0
..1..0..1..0..0..0..0. .0..1..1..1..0..1..0. .1..1..0..0..0..0..1
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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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