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A228390
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T(n,k)=Number of nXk binary arrays with top left value 1 and no two ones adjacent horizontally or vertically.
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11
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1, 1, 1, 2, 2, 2, 3, 5, 5, 3, 5, 12, 21, 12, 5, 8, 29, 72, 72, 29, 8, 13, 70, 268, 382, 268, 70, 13, 21, 169, 963, 2104, 2104, 963, 169, 21, 34, 408, 3513, 11449, 17578, 11449, 3513, 408, 34, 55, 985, 12732, 62546, 143072, 143072, 62546, 12732, 985, 55, 89, 2378
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OFFSET
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1,4
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COMMENTS
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Table starts
..1...1.....2.......3........5..........8...........13............21
..1...2.....5......12.......29.........70..........169...........408
..2...5....21......72......268........963.........3513.........12732
..3..12....72.....382.....2104......11449........62546........341249
..5..29...268....2104....17578.....143072......1177709.......9646285
..8..70...963...11449...143072....1755243.....21683149.....267157140
.13.169..3513...62546..1177709...21683149....402968942....7458864720
.21.408.12732..341249..9646285..267157140...7458864720..207573951234
.34.985.46274.1862631.79185086.3294926929.138305554175.5784184947686
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LINKS
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FORMULA
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Empirical for column k:
k=1: a(n) = a(n-1) +a(n-2)
k=2: a(n) = 2*a(n-1) +a(n-2)
k=3: a(n) = 2*a(n-1) +6*a(n-2) -a(n-4)
k=4: a(n) = 4*a(n-1) +9*a(n-2) -5*a(n-3) -4*a(n-4) +a(n-5)
k=5: [order 9]
k=6: [order 11]
k=7: [order 21]
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EXAMPLE
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Some solutions for n=4 k=4
..1..0..1..0....1..0..1..0....1..0..1..0....1..0..1..0....1..0..1..0
..0..0..0..1....0..0..0..0....0..0..0..1....0..1..0..1....0..0..0..0
..1..0..1..0....0..0..0..0....1..0..0..0....0..0..1..0....1..0..0..0
..0..1..0..0....0..1..0..1....0..1..0..1....0..0..0..0....0..0..0..1
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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