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A204717
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Number of (n+1) X 3 0..1 arrays with the permanents of 2 X 2 subblocks nondecreasing rightwards and downwards.
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1
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51, 261, 1271, 5821, 26128, 115060, 502546, 2181023, 9435107, 40725864, 175575234, 756334373, 3256622029, 14018388717, 60333239964, 259639675364, 1117272873312, 4807636088206, 20686854358737, 89012629944208, 383005849761933
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OFFSET
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1,1
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COMMENTS
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Column 2 of A204723.
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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) = 7*a(n-1) -a(n-2) -74*a(n-3) +80*a(n-4) +292*a(n-5) -406*a(n-6) -510*a(n-7) +827*a(n-8) +333*a(n-9) -745*a(n-10) +24*a(n-11) +246*a(n-12) -72*a(n-13).
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EXAMPLE
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Some solutions for n=4
..0..1..0....0..0..0....1..1..1....0..1..1....1..0..0....1..0..0....1..1..0
..1..1..1....1..0..1....1..0..1....0..0..1....1..0..1....0..0..1....1..0..1
..1..0..1....0..0..0....0..1..1....0..1..0....1..0..1....1..0..1....0..1..0
..1..1..0....0..1..1....1..1..0....1..1..1....1..0..1....0..1..1....1..1..1
..0..1..1....0..1..0....1..0..1....0..1..1....0..0..1....1..1..1....1..0..1
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CROSSREFS
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Cf. A204723.
Sequence in context: A030535 A201813 A193250 * A253921 A204956 A243462
Adjacent sequences: A204714 A204715 A204716 * A204718 A204719 A204720
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin Jan 18 2012
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STATUS
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approved
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