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A233710
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Number of (n+1) X (1+1) 0..4 arrays with every 2 X 2 subblock having the sum of the squares of the edge differences equal to 14.
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1
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96, 444, 1992, 9100, 41256, 187780, 853104, 3879380, 17632896, 80165004, 364415160, 1656658972, 7531077336, 34236366580, 155637689056, 707528207972, 3216412089072, 14621779785788, 66470416900008, 302173810603052
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OFFSET
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1,1
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LINKS
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FORMULA
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Empirical: a(n) = 24*a(n-2) + 14*a(n-3) - 129*a(n-4) - 68*a(n-5) + 228*a(n-6) + 64*a(n-7) - 128*a(n-8).
Empirical g.f.: 4*x*(24 + 111*x - 78*x^2 - 725*x^3 - 96*x^4 + 1324*x^5 + 208*x^6 - 736*x^7) / (1 - 24*x^2 - 14*x^3 + 129*x^4 + 68*x^5 - 228*x^6 - 64*x^7 + 128*x^8). - Colin Barker, Oct 11 2018
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EXAMPLE
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Some solutions for n=5:
..4..2....1..3....2..4....4..2....4..3....3..4....0..0....2..4....3..2....4..2
..1..2....4..4....1..1....1..1....1..1....3..1....3..1....1..4....3..0....4..1
..1..4....3..1....2..4....4..3....3..0....3..4....3..0....3..3....1..1....4..3
..2..2....0..1....1..1....4..1....1..1....1..4....3..2....1..4....0..3....4..1
..4..1....3..1....0..3....2..1....0..3....1..3....0..0....3..3....0..1....3..1
..4..3....0..1....2..3....4..4....2..2....1..0....1..3....0..2....3..3....0..1
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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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