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A218813
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Hilltop maps: number of 4Xn binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or antidiagonal neighbor in a random 0..3 4Xn array
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1
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1, 225, 3843, 63499, 1015637, 16247233, 259935681, 4158793313, 66538666069, 1064587366577, 17032902497577, 272518501016117, 4360168964895763, 69760670600929839, 1116138204971281197, 17857690900483942101
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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=3
..1..0..1....0..1..1....1..1..0....1..1..1....0..1..1....1..0..1....1..0..0
..0..1..0....1..0..1....1..1..1....0..1..0....0..0..0....1..0..0....0..1..1
..0..1..1....1..0..1....1..1..1....1..1..0....0..1..0....0..0..1....0..1..0
..0..1..0....1..1..0....1..1..1....0..0..1....0..1..1....0..1..1....1..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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