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Search: id:A009132
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| A009132 |
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Expansion of cosh(ln(1+x))/exp(x). |
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+0
2
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| 1, -1, 2, -7, 31, -161, 976, -6847, 54797, -493201, 4932046, -54252551, 651030667, -8463398737, 118487582396, -1777313736031, 28437019776601, -483429336202337, 8701728051642202, -165332832981201991, 3306656659624039991
(list; graph; listen)
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OFFSET
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0,3
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FORMULA
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a(n) = (-1)^n/2*floor(n!*exp(1)-n+1), n>0. - Vladeta Jovovic (vladeta(AT)eunet.rs), Aug 17 2002
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MATHEMATICA
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Cosh[ Log[ 1+x ] ]/Exp[ x ]
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CROSSREFS
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Cf. A009578.
Sequence in context: A107595 A030882 A030966 this_sequence A125275 A007446 A002872
Adjacent sequences: A009129 A009130 A009131 this_sequence A009133 A009134 A009135
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KEYWORD
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sign,easy
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AUTHOR
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R. H. Hardin (rhhardin(AT)att.net)
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EXTENSIONS
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Extended with signs Mar 15 1997 by Olivier Gerard.
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