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A190032
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Number of (n+2) X 10 binary arrays with every 3 X 3 subblock commuting with each horizontal and vertical neighbor 3 X 3 subblock.
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1
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1508, 423, 610, 966, 1418, 1834, 2362, 3018, 3834, 5122, 6886, 9242, 12530, 16874, 22626, 30959, 42112, 57029, 77815, 105765, 143231, 194899, 264884, 359302, 488708, 664381, 901953, 1226181, 1666661, 2263458, 3076317, 4181101, 5679774, 7718737
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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) = 2*a(n-1) -a(n-2) +a(n-3) -2*a(n-4) +a(n-5) +a(n-6) -a(n-7) for n>16.
Empirical g.f.: x*(1508 - 2593*x + 1272*x^2 - 1339*x^3 + 2689*x^4 - 1308*x^5 - 1565*x^6 + 1117*x^7 + 9*x^8 + 4*x^9 - 104*x^10 + 16*x^11 - 68*x^12 - 76*x^13 + 361*x^15) / ((1 - x)*(1 - x - x^3 + x^4 - x^6)). - Colin Barker, May 03 2018
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EXAMPLE
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Some solutions for 4 X 10:
..0..0..1..0..0..0..0..0..1..1....1..0..0..0..0..0..0..0..1..0
..0..0..0..1..0..0..0..0..0..1....0..1..0..0..0..0..0..0..0..0
..0..0..0..0..1..0..0..0..0..0....0..0..1..0..0..0..0..0..0..0
..0..0..0..0..0..1..0..0..0..0....1..0..0..1..0..0..0..0..0..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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