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A238041
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Number of (n+1)X(3+1) 0..2 arrays with the upper median minus the lower median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one
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1
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1440, 10812, 81524, 621780, 4837484, 36440340, 282305082, 2134998732, 16538701324, 124970610892, 968345824398, 7317821287212, 56696867316476, 428465558610908, 3319739506259962, 25087428509423164, 194376018181118344
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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) = 35*a(n-2) +1365*a(n-4) +5818*a(n-6) -253745*a(n-8) -2515364*a(n-10) +10622583*a(n-12) +185736185*a(n-14) +215793766*a(n-16) -2565871459*a(n-18) +1332702148*a(n-20) +36260764417*a(n-22) -76174294334*a(n-24) -318514722516*a(n-26) +853854046952*a(n-28) +424255350704*a(n-30) -1871720624096*a(n-32) -110445159552*a(n-34) +754983001216*a(n-36) -22781154048*a(n-38) -449740093440*a(n-40) +150005694464*a(n-42) +20312506368*a(n-44) +3601989632*a(n-46) +1937768448*a(n-48) +134217728*a(n-50)
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EXAMPLE
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Some solutions for n=3
..0..0..1..1....1..1..1..0....1..0..0..1....2..1..0..0....0..0..1..0
..1..0..1..2....2..2..0..1....2..0..0..1....1..1..0..0....2..0..1..2
..1..0..0..0....2..1..2..1....1..1..2..1....2..2..1..1....1..0..0..0
..2..1..2..2....2..1..0..0....2..2..2..0....1..2..0..2....2..1..2..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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