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A207593
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Number of 6 X n 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 1 and 1 1 1 vertically.
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1
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18, 324, 612, 2232, 7272, 25776, 85536, 300096, 1004364, 3501756, 11782620, 40900716, 138145104, 477983232, 1619007480, 5587936560, 18968405364, 65343675996, 222184777860, 764259590844, 2602091320056, 8940128392080
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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) = -a(n-1) + 16*a(n-2) + 18*a(n-3) - 61*a(n-4) - 61*a(n-5) + 66*a(n-6) + 58*a(n-7) - 8*a(n-8) - 8*a(n-9) for n>11.
Empirical g.f.: 18*x*(1 + 19*x + 36*x^2 - 148*x^3 - 279*x^4 + 399*x^5 + 594*x^6 - 368*x^7 - 410*x^8 + 44*x^9 + 52*x^10) / (1 + x - 16*x^2 - 18*x^3 + 61*x^4 + 61*x^5 - 66*x^6 - 58*x^7 + 8*x^8 + 8*x^9). - Colin Barker, Jun 24 2018
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EXAMPLE
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Some solutions for n=4:
1 0 1 1 1 1 0 0 0 1 0 1 0 1 0 0 0 1 1 1
0 1 0 1 0 1 1 0 1 1 1 0 1 0 1 0 1 1 0 1
1 0 1 0 1 0 1 0 1 0 1 1 1 1 1 0 1 0 1 0
0 1 0 1 0 1 0 0 0 1 0 0 0 1 0 0 0 1 1 0
1 1 1 0 1 0 1 0 1 0 1 1 1 0 1 0 1 1 0 0
1 0 1 0 1 0 1 0 0 1 1 0 1 1 0 0 1 0 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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