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A236896
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Number of (n+1)X(2+1) 0..2 arrays with the maximum plus the upper median of every 2X2 subblock equal
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1
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339, 3205, 30644, 337861, 3782769, 43538228, 504121651, 5869125835, 68447883704, 799193185177, 9335513529061, 109078340464240, 1274639900671115, 14895774356170087, 174080704237509648, 2034438282599485301
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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) = 20*a(n-1) -50*a(n-2) -1079*a(n-3) +5929*a(n-4) +13546*a(n-5) -136152*a(n-6) +32559*a(n-7) +1230196*a(n-8) -1321510*a(n-9) -5558982*a(n-10) +8606104*a(n-11) +13433556*a(n-12) -26908536*a(n-13) -16223728*a(n-14) +45800336*a(n-15) +5469360*a(n-16) -41824640*a(n-17) +6747552*a(n-18) +17907200*a(n-19) -5889280*a(n-20) -2304000*a(n-21) +921600*a(n-22)
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EXAMPLE
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Some solutions for n=3
..0..2..2....1..2..2....0..2..2....0..2..0....1..2..0....0..2..1....1..2..1
..0..2..1....0..2..1....2..2..0....1..2..1....1..2..2....0..1..0....2..1..2
..0..2..2....1..2..2....2..2..0....1..2..0....2..1..2....1..2..1....2..2..1
..2..2..1....0..2..0....2..1..2....1..2..1....0..2..1....1..1..1....2..2..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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