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A194569
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Number of lower triangles of an n X n 0..1 array with new values introduced in row major order 0..1 and no element equal to more than two horizontal or vertical neighbors
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1
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1, 4, 25, 232, 3182, 65372, 1988549, 90079152, 6068358966, 607621801869, 90481144660781, 20030966609918016, 6592839659614699902, 3226130598077418710561, 2346968934938492776129480
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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 3X3
..0......0......0......0......0......0......0......0......0......0......0
..0.1....0.1....1.1....1.0....0.0....0.1....1.1....1.0....0.1....0.0....1.1
..1.1.0..0.1.0..1.0.1..1.1.0..1.0.1..0.1.1..1.0.0..1.0.1..0.0.0..1.1.1..0.1.0
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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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