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A183648
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Number of (n+1) X 6 0..4 arrays with every 2 X 2 subblock summing to 8.
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1
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25405, 50125, 116653, 307525, 889525, 2764525, 9103453, 31446805, 113099845, 421059325, 1615331053, 6363378085, 25670138965, 105816160525, 444967075453, 1906187885365, 8309240278885, 36817014596125, 165639030032653
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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) = 15*a(n-1) - 85*a(n-2) + 225*a(n-3) - 274*a(n-4) + 120*a(n-5).
Empirical g.f.: x*(25405 - 330950*x + 1524203*x^2 - 2897770*x^3 + 1875000*x^4) / ((1 - x)*(1 - 2*x)*(1 - 3*x)*(1 - 4*x)*(1 - 5*x)). - Colin Barker, Apr 01 2018
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EXAMPLE
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Some solutions for 3 X 6:
4 4 1 1 1 1 2 0 0 2 2 3 4 4 2 1 0 1 2 3 0 2 1 1
0 0 3 3 3 3 2 4 4 2 2 1 0 0 2 3 4 3 1 2 3 3 2 4
4 4 1 1 1 1 2 0 0 2 2 3 4 4 2 1 0 1 2 3 0 2 1 1
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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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