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A251475
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Number of (n+1)X(1+1) 0..3 arrays with every 2X2 subblock summing to a prime and those sums nondecreasing in every row and column
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1
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114, 586, 2908, 12670, 54344, 218854, 874280, 3378058, 12982168, 48990334, 184002984, 684371770, 2533034424, 9331611118, 34194048808, 125124256330, 455164143992, 1657208404702, 5994854678120, 21741111638170, 78297688018744
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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) = 47*a(n-2) -908*a(n-4) +9400*a(n-6) -57072*a(n-8) +208368*a(n-10) -447552*a(n-12) +518400*a(n-14) -248832*a(n-16)
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EXAMPLE
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Some solutions for n=4
..1..1....0..1....3..0....1..0....1..3....0..2....0..1....1..0....1..0....0..3
..3..0....0..1....0..2....1..1....1..0....3..0....2..0....1..1....2..0....0..0
..1..3....3..1....1..2....0..3....1..3....2..2....0..1....1..0....1..0....0..3
..3..0....1..0....0..2....1..3....1..0....3..0....3..3....2..2....1..1....0..0
..3..1....1..3....2..1....0..3....3..1....2..2....2..3....2..1....0..3....0..3
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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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