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A210931
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Number of n X n 0..3 symmetric matrices with every element equal to zero, one or two horizontal and vertical neighbors, and new values 0..3 introduced in lower triangle row major order
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0
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1, 5, 178, 39460, 35878251, 125478724962, 1683060156006386, 86575081776631287402, 17078491833610134896199822, 12920202409647854108765238718313, 37484549282125499262636528834124614593
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OFFSET
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1,2
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LINKS
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EXAMPLE
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Some solutions for n=4
..0..0..1..1....0..1..2..2....0..0..2..3....0..0..1..1....0..1..0..2
..0..0..0..1....1..0..2..1....0..1..2..2....0..1..0..0....1..1..0..2
..1..0..2..1....2..2..2..0....2..2..3..2....1..0..1..2....0..0..1..3
..1..1..1..1....2..1..0..3....3..2..2..0....1..0..2..1....2..2..3..3
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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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