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A305478
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Number of nX4 0..1 arrays with every element unequal to 0, 1, 3, 6 or 8 king-move adjacent elements, with upper left element zero.
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1
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5, 17, 21, 48, 98, 192, 368, 732, 1480, 2932, 5776, 11486, 22896, 45464, 90186, 179214, 356304, 707856, 1405988, 2793618, 5551294, 11029574, 21913242, 43539452, 86510224, 171885810, 341514604, 678553342, 1348218756, 2678763818, 5322403858
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OFFSET
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1,1
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COMMENTS
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Column 4 of A305482.
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LINKS
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R. H. Hardin, Table of n, a(n) for n = 1..210
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FORMULA
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Empirical: a(n) = a(n-1) +5*a(n-3) +a(n-5) -7*a(n-6) -7*a(n-7) -2*a(n-8) +2*a(n-9) +2*a(n-10) for n>13
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EXAMPLE
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Some solutions for n=5
..0..0..0..1. .0..1..1..1. .0..1..1..0. .0..1..1..1. .0..0..0..1
..0..0..0..0. .1..1..1..1. .1..1..1..1. .1..1..1..1. .0..0..0..0
..0..0..1..1. .1..1..1..1. .1..1..1..1. .1..1..1..1. .0..0..0..0
..0..0..0..1. .1..1..1..1. .1..1..1..0. .1..0..1..1. .0..0..1..0
..0..0..0..0. .0..1..1..0. .1..1..0..0. .1..1..1..1. .1..0..1..1
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CROSSREFS
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Cf. A305482.
Sequence in context: A211426 A224513 A302423 * A262620 A191210 A191143
Adjacent sequences: A305475 A305476 A305477 * A305479 A305480 A305481
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin, Jun 02 2018
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STATUS
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approved
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