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A298549
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Number of nX3 0..1 arrays with every element equal to 0, 2, 3, 5 or 7 king-move adjacent elements, with upper left element zero.
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1
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1, 7, 4, 14, 16, 51, 104, 262, 689, 1784, 4767, 12968, 35155, 96254, 264440, 726815, 2002456, 5521018, 15227274, 42020683, 115979875, 320151219, 883859925, 2440243349, 6737508423, 18602828041, 51364692406, 141825760260, 391605586640
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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) = 4*a(n-1) -a(n-2) -7*a(n-3) -5*a(n-4) +13*a(n-5) +19*a(n-6) -27*a(n-7) +a(n-8) +3*a(n-9) -55*a(n-10) +37*a(n-11) +55*a(n-12) -23*a(n-13) -a(n-14) +9*a(n-15) -16*a(n-16) -11*a(n-17) +4*a(n-18) +2*a(n-19) for n>20
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EXAMPLE
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Some solutions for n=7
.0..0..1. .0..1..1.. .0..1..0. .0..0..0. .0..0..1. .0..1..1. .0..1..0.
.1..0..0. .1..1..0.. .0..0..0. .1..0..1. .1..0..0. .1..1..0. .0..0..0.
.1..1..1. .0..0..0.. .1..1..0. .1..1..1. .0..0..1. .0..0..0. .1..1..0.
.0..1..1. .0..0..1.. .1..1..0. .0..0..1. .1..0..0. .0..1..0. .0..1..0.
.1..1..1. .0..0..0.. .0..0..0. .1..0..0. .0..0..1. .1..1..1. .0..0..1.
.1..0..0. .1..1..0.. .0..1..0. .1..1..1. .1..1..1. .0..0..0. .1..1..1.
.0..0..1. .0..1..1.. .1..1..1. .1..0..1. .1..0..1. .1..0..1. .1..0..1.
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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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