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A262423
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Number of (4+1)X(n+1) 0..1 arrays with each row divisible by 3 and column not divisible by 3, read as a binary number with top and left being the most significant bits.
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1
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21, 48, 1701, 18228, 428301, 7577424, 163388421, 3287265300, 69481709901, 1443547193328, 30363542104581, 635919555126708, 13359727300650381, 280364385485387664, 5888252348126720901, 123632237885054793300
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OFFSET
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1,1
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COMMENTS
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Row 4 of A262420.
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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) = 21*a(n-1) +189*a(n-2) -3969*a(n-3) -10719*a(n-4) +225099*a(n-5) +250803*a(n-6) -5266863*a(n-7) -2527200*a(n-8) +53071200*a(n-9) +9062928*a(n-10) -190321488*a(n-11)
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EXAMPLE
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Some solutions for n=4
..0..0..1..1..0....1..0..1..0..1....1..1..0..0..0....1..0..0..1..0
..0..0..0..0..0....0..1..0..0..1....0..0..0..1..1....1..0..0..1..0
..1..1..0..0..0....1..1..0..1..1....0..0..1..1..0....1..0..0..1..0
..0..1..0..0..1....1..1..0..0..0....0..0..1..1..0....0..1..0..0..1
..0..1..1..0..0....1..0..0..1..0....0..1..1..0..0....0..0..1..1..0
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CROSSREFS
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Cf. A262420.
Sequence in context: A146705 A146713 A140681 * A020178 A347372 A141556
Adjacent sequences: A262420 A262421 A262422 * A262424 A262425 A262426
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin, Sep 22 2015
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STATUS
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approved
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