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A240514
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Number of nX3 0..1 arrays with no element equal to exactly two horizontal and vertical neighbors, with new values 0..1 introduced in row major order
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1
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3, 6, 10, 28, 73, 196, 515, 1376, 3686, 9914, 26681, 71876, 193749, 522510, 1409414, 3802164, 10257707, 27675148, 74669353, 201466240, 543583450, 1466670482, 3957312647, 10677488468, 28809678971, 77733469590, 209738364682
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OFFSET
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1,1
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COMMENTS
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Column 3 of A240519
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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) = 4*a(n-1) -3*a(n-2) -2*a(n-3) +2*a(n-4) +2*a(n-5) -7*a(n-6) -8*a(n-7) +15*a(n-8) +4*a(n-9) -8*a(n-10) -4*a(n-11) +15*a(n-12) +8*a(n-13) -7*a(n-14) -2*a(n-15) +2*a(n-16) +2*a(n-17) -3*a(n-18) -4*a(n-19) -a(n-20)
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EXAMPLE
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Some solutions for n=4
..0..1..0....0..1..0....0..1..0....0..1..0....0..1..0....0..1..1....0..1..0
..1..0..0....1..0..1....0..0..1....1..1..1....0..0..1....1..0..0....1..0..0
..0..1..0....0..1..0....0..1..0....0..0..0....0..1..0....0..1..1....1..1..0
..1..0..1....1..0..1....1..1..1....1..0..1....1..0..1....1..0..0....1..0..1
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CROSSREFS
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Sequence in context: A068866 A110891 A197435 * A115887 A068195 A080506
Adjacent sequences: A240511 A240512 A240513 * A240515 A240516 A240517
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin, Apr 06 2014
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STATUS
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approved
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