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A210822
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Number of (n+1)X(n+1) 0..3 symmetric matrices containing all values 0..3 with every 2X2 subblock having three or four distinct values, and new values 0..3 introduced in lower triangle row major order
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0
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0, 16, 1087, 177647, 81795421, 108046374072, 410104028479299, 4472498652495173605, 140150219505027600078339, 12618876507902926558407977689, 3264615282814988282656326026638915
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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=3
..0..1..2..1....0..1..3..1....0..1..3..0....0..1..1..0....0..1..1..0
..1..2..3..2....1..2..1..0....1..2..0..2....1..2..0..3....1..2..0..2
..2..3..0..2....3..1..3..0....3..0..3..2....1..0..3..2....1..0..3..1
..1..2..2..1....1..0..0..1....0..2..2..1....0..3..2..1....0..2..1..2
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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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