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A234424
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Number of (n+1)X(1+1) 0..7 arrays with every 2X2 subblock having the sum of the absolute values of the edge differences equal to 14 and no adjacent elements equal
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1
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448, 4516, 44140, 453728, 4641220, 47946684, 494928936, 5118554604, 52929477520, 547525514800, 5663733188684, 58591028515180, 606119482599020, 6270340071097572, 64866996054961716, 671054166304469780
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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) = 9*a(n-1) +64*a(n-2) -451*a(n-3) -1542*a(n-4) +7659*a(n-5) +16809*a(n-6) -48643*a(n-7) -76610*a(n-8) +75468*a(n-9) +91816*a(n-10) -33928*a(n-11) -30960*a(n-12)
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EXAMPLE
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Some solutions for n=3
..2..0....7..0....4..7....0..6....1..5....7..5....0..3....6..7....6..7....5..0
..5..7....6..1....0..6....3..7....0..7....0..2....7..6....2..0....0..6....3..5
..0..3....2..4....2..7....0..2....5..6....7..4....6..0....7..3....4..7....5..0
..2..7....6..1....0..3....5..0....7..1....1..5....7..6....5..0....0..1....7..6
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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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