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A054603
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a(n) = Sum_{d|4} phi(d)*n^(4/d).
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2
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0, 4, 24, 96, 280, 660, 1344, 2464, 4176, 6660, 10120, 14784, 20904, 28756, 38640, 50880, 65824, 83844, 105336, 130720, 160440, 194964, 234784, 280416, 332400, 391300, 457704, 532224, 615496, 708180, 810960, 924544, 1049664
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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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a(n) = n^4 + n^2 + 2n.
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MATHEMATICA
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LinearRecurrence[{5, -10, 10, -5, 1}, {0, 4, 24, 96, 280}, 40] (* Harvey P. Dale, Nov 29 2015 *)
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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