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A204611
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Number of (n+1)X4 0..1 arrays with the determinants of 2X2 subblocks nondecreasing rightwards and downwards
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1
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125, 749, 4901, 31805, 205117, 1322417, 8522985, 54938417, 354134921, 2282874145, 14716407353, 94869591953, 611581623337, 3942604144385, 25416311360025, 163848400648049, 1056262956080393, 6809292269424865, 43896707048892665
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OFFSET
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1,1
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COMMENTS
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Column 3 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) = 9*a(n-1) -8*a(n-2) -72*a(n-3) +96*a(n-4) +128*a(n-5) -128*a(n-6) -64*a(n-7) for n>10
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EXAMPLE
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Some solutions for n=4
..1..0..1..1....1..1..0..0....1..0..1..1....1..0..0..0....1..1..0..0
..0..0..0..0....1..0..0..0....1..0..1..1....0..0..0..1....0..0..0..1
..0..1..1..0....0..0..1..1....0..0..1..1....0..1..0..1....0..1..0..1
..0..0..0..0....0..0..0..0....1..0..0..0....0..1..0..1....0..1..0..1
..1..1..1..1....1..0..0..1....1..0..0..0....0..0..0..0....0..0..0..0
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CROSSREFS
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Sequence in context: A253345 A016815 A253352 * A296037 A355885 A088896
Adjacent sequences: A204608 A204609 A204610 * A204612 A204613 A204614
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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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