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A229401
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Number of nX7 0..2 arrays with top left element 0, horizontal differences mod 3 never 1, vertical differences mod 3 never -1, and antidiagonal differences never 0
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1
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64, 610, 6604, 75965, 899860, 10826489, 131393852, 1602580515, 19601243880, 240116025296, 2943946903168, 36111350203982, 443068796520552, 5437043793984221, 66725434580737752, 818919799977995873
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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 64 (see link above)
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EXAMPLE
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Some solutions for n=4
..0..2..1..0..0..2..1....0..0..0..2..1..1..0....0..2..1..1..1..0..0
..0..2..1..1..0..2..1....1..1..0..2..2..1..1....1..0..2..2..1..1..0
..0..2..2..1..0..2..2....2..1..1..0..0..2..2....1..0..0..2..2..1..1
..1..0..0..2..1..0..0....2..2..1..1..1..0..0....2..1..1..0..0..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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