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Search: id:A130089
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| A130089 |
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a(n) = denominator of product{k=1 to n} k^mu(n+1-k), where mu(k) = A008683(k). |
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+0
4
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| 1, 1, 2, 3, 12, 20, 45, 14, 70, 864, 525, 880, 6237, 3328, 3003, 900, 25025, 60928, 53703, 19456, 3997125, 1209600, 3556553, 30912, 67643667, 11264000, 244375, 26687232, 52055003, 2702336, 351469125, 90272000, 47453715, 1284636672
(list; graph; listen)
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OFFSET
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1,3
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LINKS
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Leroy Quet, Home Page (listed in lieu of email address)
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EXAMPLE
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a(5)=denom(1^(-1)*2^(0)*3^(-1)*4^(-1)*5^(1))=denom(5/12)=12.
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MAPLE
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with(numtheory): a:=n->denom(mul(k^mobius(n+1-k), k=1..n)): seq(a(n), n=1..41); - Emeric Deutsch (deutsch(AT)duke.poly.edu), May 09 2007
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CROSSREFS
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Cf. A130086, A130087, A130088.
Sequence in context: A100570 A056700 A140989 this_sequence A126292 A083265 A067391
Adjacent sequences: A130086 A130087 A130088 this_sequence A130090 A130091 A130092
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KEYWORD
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frac,nonn
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AUTHOR
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Leroy Quet May 06 2007
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EXTENSIONS
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More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), May 09 2007
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