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A298133
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T(n,k)=Number of nXk 0..1 arrays with every element equal to 2, 3, 4 or 7 king-move adjacent elements, with upper left element zero.
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7
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0, 0, 0, 0, 1, 0, 0, 2, 2, 0, 0, 5, 4, 5, 0, 0, 10, 13, 13, 10, 0, 0, 25, 62, 15, 62, 25, 0, 0, 54, 223, 233, 233, 223, 54, 0, 0, 125, 826, 1055, 2621, 1055, 826, 125, 0, 0, 282, 3200, 5782, 21537, 21537, 5782, 3200, 282, 0, 0, 641, 12098, 36225, 175014, 285084, 175014
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OFFSET
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1,8
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COMMENTS
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Table starts
.0...0.....0......0........0.........0...........0.............0..............0
.0...1.....2......5.......10........25..........54...........125............282
.0...2.....4.....13.......62.......223.........826..........3200..........12098
.0...5....13.....15......233......1055........5782.........36225.........205348
.0..10....62....233.....2621.....21537......175014.......1557284.......13225388
.0..25...223...1055....21537....285084.....3752401......52922003......714854991
.0..54...826...5782...175014...3752401....76791444....1706951987....36185741209
.0.125..3200..36225..1557284..52922003..1706951987...58599163176..1933759163417
.0.282.12098.205348.13225388.714854991.36185741209.1933759163417.99650656591710
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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-2) +4*a(n-3) +2*a(n-4)
k=3: [order 18]
k=4: [order 53] for n>56
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EXAMPLE
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Some solutions for n=5 k=4
..0..0..1..1. .0..0..1..1. .0..0..1..1. .0..0..0..0. .0..0..0..0
..1..0..0..1. .1..0..0..1. .0..1..1..0. .0..1..1..0. .1..0..0..1
..1..1..1..1. .1..1..0..1. .1..1..0..0. .1..0..1..1. .1..1..1..1
..1..0..0..1. .1..0..1..1. .0..1..0..1. .1..0..0..1. .1..0..0..1
..0..0..0..0. .0..0..0..1. .0..0..1..1. .1..1..0..0. .0..0..0..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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