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A184270
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Number of distinct n X 8 toroidal binary arrays.
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2
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36, 4150, 699252, 134223976, 27487816992, 5864063066500, 1286742755471400, 288230376353050816, 65588423374144427520, 15111572745224096425720, 3516875111606393874082104, 825293359523595646117352176, 195023169265881489687952047216
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OFFSET
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1,1
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LINKS
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FORMULA
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MAPLE
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with(numtheory):
a:= n-> add(add(phi(c)*phi(d) *2^(8*n/ilcm(c, d)),
d=divisors(n)), c=[1, 2, 4, 8])/(8*n):
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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