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A299574
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T(n,k)=Number of nXk 0..1 arrays with every element equal to 1, 2, 4, 5, 7 or 8 king-move adjacent elements, with upper left element zero.
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7
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0, 1, 1, 1, 3, 1, 2, 7, 7, 2, 3, 13, 15, 13, 3, 5, 23, 25, 25, 23, 5, 8, 49, 47, 78, 47, 49, 8, 13, 99, 113, 237, 237, 113, 99, 13, 21, 189, 265, 844, 766, 844, 265, 189, 21, 34, 383, 621, 2604, 3324, 3324, 2604, 621, 383, 34, 55, 777, 1473, 8136, 15186, 17389, 15186, 8136
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OFFSET
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1,5
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COMMENTS
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Table starts
..0...1....1.....2......3.......5........8........13.........21..........34
..1...3....7....13.....23......49.......99.......189........383.........777
..1...7...15....25.....47.....113......265.......621.......1473........3443
..2..13...25....78....237.....844.....2604......8136......26760.......86924
..3..23...47...237....766....3324....15186.....56870.....234074.....1011095
..5..49..113...844...3324...17389....98466....505680....2704280....14896422
..8..99..265..2604..15186...98466...784334...5286269...38000347...284230090
.13.189..621..8136..56870..505680..5286269..46965400..449355259..4443621368
.21.383.1473.26760.234074.2704280.38000347.449355259.5736969146.75908899351
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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) +4*a(n-3) -4*a(n-4) for n>5
k=3: [order 14] for n>15
k=4: [order 67] for n>68
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EXAMPLE
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Some solutions for n=6 k=7
..0..1..0..0..1..1..0. .0..1..0..0..0..1..1. .0..0..0..0..1..1..0
..1..0..0..0..0..1..0. .1..0..0..0..0..0..1. .1..0..0..0..0..1..0
..0..1..1..1..1..1..0. .1..0..0..0..0..0..0. .1..1..0..0..0..1..1
..0..1..1..1..1..0..1. .0..1..0..0..0..0..0. .0..0..0..0..0..1..1
..0..1..1..1..1..1..0. .1..0..0..0..0..0..1. .1..1..0..1..0..1..1
..1..0..1..1..0..0..1. .1..0..1..1..1..1..0. .1..0..0..1..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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