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A210926
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Number of n X n 0..3 symmetric matrices with every element equal to one, two or three horizontal and vertical neighbors, and new values 0..3 introduced in lower triangle row major order
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1
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0, 1, 4, 95, 9220, 3055073, 3000338892, 8812917082915, 76878364475257062, 1995945343880703817038, 154116672749530867319434810
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OFFSET
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1,3
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LINKS
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EXAMPLE
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Some solutions for n=4
..0..0..1..0....0..0..1..1....0..0..0..1....0..0..0..0....0..0..1..1
..0..0..1..0....0..0..1..1....0..1..1..1....0..1..1..0....0..0..1..0
..1..1..2..2....1..1..1..0....0..1..1..0....0..1..1..0....1..1..1..0
..0..0..2..2....1..1..0..0....1..1..0..0....0..0..0..0....1..0..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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