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A298096
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Number of nX4 0..1 arrays with every element equal to 3, 4, 5 or 6 king-move adjacent elements, with upper left element zero.
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1
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0, 2, 1, 3, 7, 20, 42, 121, 291, 782, 1987, 5247, 13553, 35592, 92599, 242445, 632707, 1654855, 4323102, 11303415, 29540495, 77227391, 201859196, 527690923, 1379374791, 3605831654, 9425790420, 24639842009, 64410102689, 168373214417
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OFFSET
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1,2
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COMMENTS
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LINKS
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FORMULA
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Empirical: a(n) = 5*a(n-2) +8*a(n-3) +2*a(n-4) -15*a(n-5) -23*a(n-6) -22*a(n-7) -9*a(n-8) +5*a(n-9) +20*a(n-10) +24*a(n-11) +23*a(n-12) +8*a(n-13) -3*a(n-14) -4*a(n-15) -2*a(n-16)
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EXAMPLE
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Some solutions for n=7
..0..0..1..1. .0..0..1..1. .0..0..1..1. .0..0..1..1. .0..0..1..1
..0..0..1..1. .0..0..1..1. .0..0..1..1. .0..0..1..1. .0..0..1..1
..1..1..1..1. .0..0..1..1. .0..0..0..1. .1..1..0..0. .0..0..1..1
..1..1..0..0. .0..1..1..1. .0..0..1..1. .1..1..0..0. .1..1..0..0
..1..1..0..0. .1..0..0..0. .0..1..1..1. .0..0..1..1. .1..1..0..0
..0..0..1..1. .1..1..0..0. .0..0..1..1. .0..0..1..1. .1..1..0..0
..0..0..1..1. .1..1..0..0. .0..0..1..1. .0..0..1..1. .1..1..0..0
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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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