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A222442
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Number of n X 6 0..3 arrays with entries increasing mod 4 by 0, 1 or 2 rightwards and downwards, starting with upper left zero.
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2
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243, 50421, 10499787, 2187822609, 455924913093, 95013316876491, 19800569621116647, 4126399930787828049, 859933842854600077173, 179208573795933519199311, 37346725549299749805268107
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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: a(n) = 312*a(n-1) -25524*a(n-2) +890339*a(n-3) -15323331*a(n-4) +129432870*a(n-5) -387838226*a(n-6) -1530469395*a(n-7) +14599631124*a(n-8) -35234863780*a(n-9) +5987707122*a(n-10) +87399541374*a(n-11) -99581148396*a(n-12) +21008679048*a(n-13).
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EXAMPLE
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Some solutions for n=3
..0..0..0..2..0..2....0..0..0..2..0..1....0..0..0..2..0..0....0..0..0..2..0..1
..0..2..0..0..1..2....0..1..2..2..0..1....0..1..2..0..2..2....0..2..2..0..1..1
..0..0..1..1..2..3....0..1..3..3..0..1....0..2..3..1..3..3....0..2..2..2..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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