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A338436
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a(n) = n! * [x^n] Product_{k=1..n, gcd(n,k) = 1} 1 / (1 - x^k/k!).
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1
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1, 1, 2, 9, 28, 245, 726, 11480, 48560, 735705, 4352050, 98329550, 483122388, 15543026746, 105478954140, 2717386363515, 25322712724800, 896697825211141, 6457456535543802, 307183340680888754, 2920059397230745400, 107461248960479482740, 1360407935621917573380
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OFFSET
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0,3
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LINKS
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MATHEMATICA
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Table[n! SeriesCoefficient[Product[1/(1 - Boole[GCD[n, k] == 1] x^k/k!), {k, 1, n}], {x, 0, n}], {n, 0, 22}]
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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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