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A224036
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Number of nX6 0..1 arrays with antidiagonals unimodal and rows and diagonals nondecreasing
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1
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7, 34, 119, 363, 1064, 3107, 9125, 26928, 79800, 237348, 708163, 2118654, 6353180, 19088180, 57442255, 173085671, 522085599, 1576088206, 4761041486, 14389487483, 43507313943, 131587493711, 398081815019, 1204514245101, 3645147239577
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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) = 7*a(n-1) -15*a(n-2) +6*a(n-3) +11*a(n-4) -4*a(n-5) -7*a(n-6) +6*a(n-7) -6*a(n-8) +8*a(n-9) -8*a(n-10) +16*a(n-11) for n>13
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EXAMPLE
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Some solutions for n=3
..0..0..0..0..0..0....0..0..0..0..0..1....0..0..0..0..0..1....0..0..0..0..0..0
..0..0..0..0..0..0....0..0..1..1..1..1....0..0..0..0..1..1....0..0..0..0..0..0
..0..0..0..1..1..1....1..1..1..1..1..1....0..0..1..1..1..1....0..0..0..0..0..0
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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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