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A211105
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1/4 the number of (n+1)X(n+1) 0..3 symmetric matrices with every 2X2 subblock having one, two or three distinct values
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1
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16, 928, 196480, 151767424, 427712112640, 4397802725483392, 164979998407434893440, 22580741254744671390333952, 11276035715844307701828163309696, 20544048912459992331220711095896934784
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OFFSET
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1,1
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LINKS
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EXAMPLE
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Some solutions for n=3
..0..0..2..3....0..0..3..0....0..0..2..0....0..0..1..3....0..2..3..3
..0..3..2..2....0..0..3..2....0..2..2..0....0..1..0..1....2..2..1..1
..2..2..3..2....3..3..0..3....2..2..3..2....1..0..1..0....3..1..2..0
..3..2..2..1....0..2..3..0....0..0..2..1....3..1..0..1....3..1..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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