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Search: id:A009739
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| A009739 |
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Expansion of tan(x).exp(x). |
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+0
5
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| 0, 1, 2, 5, 12, 41, 142, 685, 3192, 19921, 116282, 887765, 6219972, 56126201, 458790022, 4776869245, 44625674352, 526589630881, 5534347077362, 72989204937125, 852334810990332, 12424192360405961, 159592488559874302
(list; graph; listen)
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OFFSET
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0,3
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FORMULA
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G.f.: exp(x)*tan(x) . [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Apr 05 2009]
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MAPLE
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restart: G(x):=exp(x)*tan(x): f[0]:=G(x): for n from 1 to 54 do f[n]:=diff(f[n-1], x) od: x:=0: seq(f[n], n=0..22 ); # [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Apr 05 2009]
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MATHEMATICA
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Tan[ x ]*Exp[ x ]
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CROSSREFS
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a(2n) = A009747(n), a(2n+1) = A003719(n).
Sequence in context: A054581 A140440 A005664 this_sequence A062272 A127137 A071787
Adjacent sequences: A009736 A009737 A009738 this_sequence A009740 A009741 A009742
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KEYWORD
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nonn,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 and signs tested Mar 15 1997 by Olivier Gerard.
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