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A038068
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Product_{k>=1}(1 + x^k)^a(k) = 1 + 3x.
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7
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3, -3, 8, -21, 48, -116, 312, -831, 2184, -5880, 16104, -44336, 122640, -341484, 956576, -2690841, 7596480, -21522228, 61171656, -174342144, 498111952, -1426403748, 4093181688, -11767919276, 33891544368, -97764009000
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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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Dirichlet convolution of A038064 with characteristic function of powers of 2.
a(n) = 1/n*(-(-3)^n + Sum_{d<n and d|n} (-1)^(n/d)*d*a(d)). - Seiichi Manyama, Jun 23 2018
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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STATUS
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approved
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