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A204610
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Number of (n+1)X3 0..1 arrays with the determinants of 2X2 subblocks nondecreasing rightwards and downwards
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1
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47, 181, 749, 3254, 14199, 62031, 271125, 1185255, 5181921, 22656123, 99057573, 433104831, 1893650697, 8279562627, 36200555181, 158278967559, 692040086289, 3025793769291, 13229621235765, 57843625143375, 252908600485401
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OFFSET
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1,1
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COMMENTS
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Column 2 of A204616
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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) = 6*a(n-1) -5*a(n-2) -12*a(n-3) +12*a(n-4) for n>7
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EXAMPLE
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Some solutions for n=4
..0..1..1....1..0..0....0..1..1....1..0..1....0..1..1....1..0..0....0..1..0
..1..0..0....0..0..1....1..0..0....0..0..1....0..0..0....1..0..0....0..1..0
..1..0..0....0..0..1....0..0..1....0..0..1....0..1..0....0..0..0....0..1..0
..1..0..0....1..0..1....1..0..1....1..0..0....0..0..0....1..1..0....0..0..0
..0..0..1....1..0..1....0..0..0....1..0..1....0..1..1....1..1..0....1..1..0
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CROSSREFS
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Sequence in context: A216827 A139992 A142916 * A158632 A142413 A065532
Adjacent sequences: A204607 A204608 A204609 * A204611 A204612 A204613
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin Jan 17 2012
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STATUS
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approved
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