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A305484
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Number of n X 3 0..1 arrays with every element unequal to 1, 2, 3, 6 or 8 king-move adjacent elements, with upper left element zero.
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1
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1, 14, 19, 27, 137, 295, 570, 2026, 4727, 10623, 31695, 77554, 186678, 514389, 1288865, 3207903, 8513828, 21596662, 54628207, 142471209, 363676271, 927239206, 2398775556, 6143042745, 15724343029, 40529736309, 103968954572, 266660435630
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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) = a(n-1) +4*a(n-2) +11*a(n-3) -9*a(n-4) -39*a(n-5) -31*a(n-6) -4*a(n-7) +37*a(n-8) +19*a(n-9) +18*a(n-10) -2*a(n-11) -4*a(n-12) -16*a(n-13) -8*a(n-14) for n>16.
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EXAMPLE
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Some solutions for n=5
..0..1..1. .0..1..1. .0..1..1. .0..0..0. .0..0..0. .0..1..1. .0..0..0
..0..1..0. .0..0..1. .0..1..0. .0..1..0. .0..1..0. .0..0..1. .1..1..1
..0..0..0. .1..1..1. .0..0..0. .0..0..0. .0..0..0. .0..0..0. .1..1..1
..1..1..0. .0..1..1. .0..1..1. .0..1..0. .0..0..1. .0..1..0. .1..0..1
..1..0..0. .0..0..1. .0..0..1. .0..1..1. .0..1..1. .0..0..0. .0..1..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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