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Search: id:A009753
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| A009753 |
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Expansion of tan(x)/(1+x). |
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+0
1
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| 0, 1, -2, 8, -32, 176, -1056, 7664, -61312, 559744, -5597440, 61925632, -743107584, 9682766848, -135558735872, 2035284795392, -32564556726272, 553807329689600, -9968531934412800, 189431195638956032, -3788623912779120640
(list; graph; listen)
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OFFSET
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0,3
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MAPLE
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restart: G(x):= tan(x)/(1+x): f[0]:=G(x): for n from 1 to 21 do f[n]:=diff(f[n-1], x) od: x:=0: seq(f[n], n=0..20); # [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Apr 03 2009]
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MATHEMATICA
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Tan[ x ]/(1+x)
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CROSSREFS
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Adjacent sequences: A009750 A009751 A009752 this_sequence A009754 A009755 A009756
Sequence in context: A137975 A051636 A081561 this_sequence A141202 A081358 A048855
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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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