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A204568
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Number of (n+1)X5 0..3 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..3 introduced in row major order
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1
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1682, 80518, 4220392, 226207388, 12184154082, 657035534014, 35439471578008, 1911668983879844, 103120042408983914, 5562564379359047286, 300059383373323671216, 16185997942290302282060, 873115606316546208696882
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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) = 66*a(n-1) -371*a(n-2) -20540*a(n-3) +324789*a(n-4) -1657430*a(n-5) +2548727*a(n-6) +4497416*a(n-7) -19534224*a(n-8) +23561568*a(n-9) -10191744*a(n-10) -1130112*a(n-11) +1975104*a(n-12) -373248*a(n-13)
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EXAMPLE
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Some solutions for n=4
..0..0..0..0..0....0..0..0..1..2....0..1..1..0..0....0..0..0..0..0
..1..0..0..2..0....0..2..0..0..1....0..0..1..1..0....1..0..0..2..0
..0..2..0..0..0....0..0..1..0..0....0..2..0..1..1....0..2..0..0..1
..1..0..3..0..3....2..0..0..3..0....2..0..1..0..1....2..1..2..0..0
..1..1..0..3..3....0..0..0..0..1....0..0..0..0..0....3..2..3..2..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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