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A210827
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Number of (n+1)X(n+1) 0..3 symmetric matrices with every 2X2 subblock having two distinct values, and new values 0..3 introduced in lower triangle row major order
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0
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3, 29, 548, 18908, 1182512, 131061397, 25883001692, 9078760225423, 5673881364653895, 6325974204854627570, 12606596349780734850457, 44979541448033730855929795
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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..1..1..1....0..1..1..0....0..1..1..1....0..1..2..1....0..1..1..2
..1..1..0..0....1..0..0..1....1..1..0..1....1..1..2..2....1..0..1..1
..1..0..0..1....1..0..1..0....1..0..0..0....2..2..2..0....1..1..0..0
..1..0..1..1....0..1..0..1....1..1..0..2....1..2..0..0....2..1..0..1
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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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