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A251397
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Number of (n+1)X(3+1) 0..3 arrays with no 2X2 subblock having the sum of its diagonal elements less than the absolute difference of its antidiagonal elements
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1
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45542, 8558283, 1606734480, 301644677965, 56631282128854, 10632092711682548, 1996093452861010528, 374751133066799206981, 70356632879370619403610, 13208914836753861239922613, 2479871817922719729400520215
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OFFSET
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1,1
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COMMENTS
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LINKS
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FORMULA
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Empirical recurrence of order 81 (see link above)
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EXAMPLE
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Some solutions for n=1
..3..0..0..3....3..2..3..0....1..3..0..1....2..2..3..1....3..3..2..3
..1..1..1..2....1..3..2..0....2..1..1..3....0..1..2..0....1..3..2..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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