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A236446
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Number of (n+1)X(2+1) 0..3 arrays colored with the difference of the maximum and minimum in each 2X2 subblock
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1
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2116, 25172, 280436, 3081484, 33804644, 372302304, 4107125100, 45253160716, 498239745892, 5488056222380, 60469751923916, 666180122487480, 7338126927909528, 80835303876178368, 890516979877141528
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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) = 36*a(n-2) +356*a(n-3) +4344*a(n-4) +20686*a(n-5) +29714*a(n-6) -31380*a(n-7) -97187*a(n-8) -8638*a(n-9) -75077*a(n-10) -613287*a(n-11) -385421*a(n-12) +493270*a(n-13) +214944*a(n-14) +4921728*a(n-15) +12218501*a(n-16) +5327294*a(n-17) -8969592*a(n-18) -18816047*a(n-19) -32373495*a(n-20) -51099082*a(n-21) -9749467*a(n-22) +62349330*a(n-23) +27150861*a(n-24) +15857513*a(n-25) +34953995*a(n-26) -21410588*a(n-27) -9398131*a(n-28) +10813876*a(n-29) -1372244*a(n-30) -440320*a(n-31) +788640*a(n-32) -207360*a(n-33) +8704*a(n-34) for n>37
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EXAMPLE
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Some solutions for n=2
..1..3..0....0..3..1....0..1..2....2..0..3....0..3..2....2..0..1....0..1..2
..1..3..1....3..3..3....2..1..2....0..1..2....3..2..3....3..2..1....2..1..1
..0..3..3....1..1..0....2..1..3....1..0..2....2..1..0....1..1..1....0..3..2
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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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