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A184267
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Number of distinct n X 5 toroidal binary arrays.
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2
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8, 108, 2192, 52488, 1342208, 35792568, 981706832, 27487816992, 781874936816, 22517998808448, 655069036708592, 19215358428046176, 567592125344909792, 16865594582168158776, 503719091506096394752, 15111572745196608608736, 455125014443154512836736
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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^(5*n/ilcm(c, d)),
d=divisors(n)), c=[1, 5])/(5*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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