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A218809
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Hilltop maps: number of nX7 binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or antidiagonal neighbor in a random 0..3 nX7 array
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1
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113, 15871, 2030789, 259935681, 33267198605, 4257699787069, 544920898689805, 69741601368666737, 8925866282195274093, 1142375383410178607437, 146206707061580643526877, 18712238989313795368235025
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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=3
..0..0..0..1..1..1..0....0..0..1..0..1..0..0....0..0..0..1..0..0..1
..0..1..0..1..0..1..1....0..0..1..1..0..0..1....0..1..1..1..0..0..0
..0..1..0..1..1..1..0....0..0..1..1..0..0..1....0..1..0..1..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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