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A301993
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Number of n X n 0..1 arrays with every element equal to 1, 2 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero.
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0
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0, 2, 5, 74, 2856, 100176, 15243860, 3267873712, 1423142192108, 1493258497764034, 2656316754272813006, 10809582885066864547012, 85481211759186744525328998, 1368540960166632565900365694716
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OFFSET
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1,2
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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..0..1..1..0. .0..0..1..1..0. .0..0..1..1..0. .0..0..1..1..1
..0..0..1..0..1. .0..1..0..0..1. .0..0..1..0..0. .0..1..0..1..0
..0..0..1..1..1. .1..1..1..1..1. .1..1..1..0..0. .1..0..0..0..0
..0..1..1..0..1. .0..0..1..1..1. .1..1..1..1..1. .1..1..0..1..0
..0..0..0..1..1. .0..0..1..0..0. .1..0..0..0..0. .1..0..1..0..0
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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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