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A181248
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Number of nX5 binary matrices with no 2X2 block having four 1's
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1
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32, 819, 22077, 587920, 15701273, 419045269, 11185495872, 298561305103, 7969215344753, 212714316418464, 5677773794982333, 151551208150533689, 4045206823611571168, 107974712600136074779, 2882062422625926933109
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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)=20*a(n-1)+188*a(n-2)-192*a(n-3)-1660*a(n-4)+2804*a(n-5)-507*a(n-6)-624*a(n-7)
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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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