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A054615
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a(n) = Sum_{d|n} phi(d)*8^(n/d).
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3
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0, 8, 72, 528, 4176, 32800, 262800, 2097200, 16781472, 134218800, 1073774880, 8589934672, 68719748256, 549755813984, 4398048608688, 35184372156480, 281474993496384, 2251799813685376, 18014398644225456, 144115188075856016
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OFFSET
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0,2
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LINKS
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FORMULA
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PROG
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(PARI) a(n) = sumdiv(n, d, eulerphi(d)*8^(n/d)); \\ Michel Marcus, Jul 11 2021
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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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