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A304227
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Number of nX5 0..1 arrays with every element unequal to 0, 1, 2 or 7 king-move adjacent elements, with upper left element zero.
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1
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16, 8, 11, 20, 31, 89, 237, 494, 1162, 3043, 7055, 16267, 40336, 96915, 227050, 547472, 1320937, 3136649, 7499193, 18030816, 43081957, 102910086, 246694312, 590518839, 1411720911, 3379538295, 8091060448, 19355807443, 46317931730, 110870212016
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OFFSET
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1,1
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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) +9*a(n-3) -14*a(n-6) for n>10
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EXAMPLE
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Some solutions for n=5
..0..0..0..0..0. .0..1..1..1..1. .0..0..0..0..1. .0..0..0..0..0
..0..0..0..0..0. .1..0..1..1..1. .0..0..0..1..0. .0..0..0..1..0
..0..0..0..0..0. .1..1..1..1..1. .0..0..0..0..0. .0..0..1..0..0
..0..0..1..1..0. .1..1..1..0..1. .0..0..0..1..0. .0..0..0..0..0
..0..0..0..0..0. .1..1..1..1..0. .0..0..0..0..1. .0..0..0..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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