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A237135
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Number of (n+1)X(1+1) 0..3 arrays with the maximum plus the upper median of every 2X2 subblock equal
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1
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256, 1500, 8414, 52484, 328768, 2145192, 14152560, 95414944, 649185798, 4478130100, 31091450584, 217843944144, 1532986230904, 10852686898168, 77047991907070, 549127517842812, 3920693547270496, 28062818940398024
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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) = 16*a(n-1) -1186*a(n-3) +4300*a(n-4) +29836*a(n-5) -178043*a(n-6) -268628*a(n-7) +3127196*a(n-8) -779130*a(n-9) -28579040*a(n-10) +32590712*a(n-11) +142648608*a(n-12) -254087072*a(n-13) -375342992*a(n-14) +955527424*a(n-15) +408264640*a(n-16) -1902301152*a(n-17) +178371840*a(n-18) +1899365760*a(n-19) -742376448*a(n-20) -734054400*a(n-21) +418037760*a(n-22)
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EXAMPLE
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Some solutions for n=4
..2..3....3..1....1..3....0..0....0..2....3..1....0..2....2..3....0..2....1..3
..3..3....3..0....3..1....1..3....1..2....0..3....3..3....2..2....3..0....0..2
..3..0....3..0....3..3....1..1....2..1....3..1....0..1....3..1....2..2....2..3
..3..3....0..3....3..3....1..3....1..2....3..1....3..3....1..2....0..3....2..1
..0..3....3..1....2..3....1..0....2..0....3..1....1..2....3..1....1..2....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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