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A297762
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T(n,k)=Number of nXk 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 2, 3 or 4 neighboring 1s.
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13
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1, 1, 1, 1, 2, 1, 1, 12, 4, 1, 1, 31, 52, 7, 1, 1, 78, 206, 186, 14, 1, 1, 225, 734, 1181, 1045, 31, 1, 1, 733, 4088, 7081, 10639, 5685, 69, 1, 1, 2305, 24801, 73352, 109228, 90727, 28565, 155, 1, 1, 7156, 130159, 759243, 2263784, 1456855, 720785, 148681, 354, 1, 1
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OFFSET
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1,5
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COMMENTS
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Table starts
.1...1......1........1..........1.............1...............1
.1...2.....12.......31.........78...........225.............733
.1...4.....52......206........734..........4088...........24801
.1...7....186.....1181.......7081.........73352..........759243
.1..14...1045....10639.....109228.......2263784........45618455
.1..31...5685....90727....1456855......59707529......2301783905
.1..69..28565...720785...18733087....1504842706....108229776807
.1.155.148681..5909241..251641086...39769163381...5394743533114
.1.354.783104.48847911.3354939709.1043883771677.267870723932943
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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)
k=2: a(n) = 3*a(n-1) -2*a(n-2) +2*a(n-3) -2*a(n-4) -a(n-5)
k=3: [order 15]
k=4: [order 33]
k=5: [order 78]
Empirical for row n:
n=1: a(n) = a(n-1)
n=2: a(n) = 4*a(n-1) -3*a(n-2) +a(n-3) +6*a(n-4) -18*a(n-5)
n=3: [order 20]
n=4: [order 52]
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EXAMPLE
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Some solutions for n=5 k=4
..1..1..1..1. .1..1..1..0. .0..1..1..1. .0..1..1..0. .1..1..1..1
..1..1..1..1. .1..1..1..1. .0..0..1..0. .1..1..1..0. .1..1..1..0
..0..0..0..0. .0..1..0..0. .0..0..1..1. .1..0..0..1. .0..0..0..1
..1..1..1..0. .1..1..1..1. .0..1..1..0. .0..1..1..1. .0..1..1..0
..0..1..1..0. .1..1..1..0. .0..0..0..0. .0..1..1..0. .0..1..1..0
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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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