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A205761
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Number of (n+1)X2 0..3 arrays with every 2X2 subblock having nonzero determinant and having the same number of clockwise edge increases as its horizontal and vertical neighbors
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1
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192, 1262, 8659, 62607, 462040, 3490700, 26672819, 205747848, 1595214033, 12413756669, 96806542939, 756001274858, 5908892541394, 46209002829411, 361485247026700, 2828432016655919, 22133840165287141, 173221954994087709
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OFFSET
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1,1
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COMMENTS
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LINKS
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FORMULA
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Empirical: a(n) = 6*a(n-1) +34*a(n-2) -95*a(n-3) -439*a(n-4) -247*a(n-5) +510*a(n-6) -285*a(n-7) -1600*a(n-8) +110*a(n-9) +1431*a(n-10) -111*a(n-11) -883*a(n-12) -96*a(n-13) +262*a(n-14) +100*a(n-15) +8*a(n-16) for n>17
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EXAMPLE
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Some solutions for 5X5
..0..1....2..2....0..1....3..1....0..3....2..1....1..2....2..0....0..3....0..1
..3..1....0..2....3..3....3..3....1..1....1..3....1..3....1..1....2..3....1..2
..1..3....1..1....1..0....1..2....1..2....2..0....3..0....3..2....3..3....0..2
..2..1....2..3....2..1....1..1....1..1....3..1....1..2....2..1....0..2....2..1
..1..2....2..2....3..2....0..1....0..1....0..2....0..1....3..2....1..1....0..3
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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