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A224740
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Number of (n+1) X 4 0..1 matrices with each 2 X 2 permanent equal.
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1
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89, 565, 2961, 18257, 107665, 661569, 4028161, 24772161, 152077313, 935846145, 5757221121, 35438268417, 218128814081, 1342810858497, 8266377695233, 50889801535489, 313290148417537, 1928708042670081, 11873713471619073
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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) = 9*a(n-1) -8*a(n-2) -88*a(n-3) +176*a(n-4) +88*a(n-5) -352*a(n-6) +80*a(n-7) +160*a(n-8) -64*a(n-9).
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EXAMPLE
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Some solutions for n=3
..0..1..1..1....1..0..0..0....1..0..0..0....1..0..1..1....0..1..1..0
..1..0..1..0....0..0..0..0....0..0..0..0....0..0..0..0....1..1..0..1
..0..1..0..1....0..0..0..0....1..0..0..0....0..0..0..1....1..0..1..1
..1..0..1..1....1..1..1..1....0..0..0..0....1..1..0..1....0..1..1..0
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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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