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Search: id:A000834
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| A000834 |
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Expansion of exp(x)(1+tan x)/(1-tan x). |
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+0
1
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| 1, 3, 9, 35, 177, 1123, 8569, 76355, 777697, 8911683, 113466729, 1589173475, 24280777617, 401898209443, 7163977596889, 136821894075395, 2787312733887937, 60331585563062403, 1382698089425999049
(list; graph; listen)
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OFFSET
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0,2
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LINKS
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R. J. Mathar, Table of n, a(n) for n = 0..161
J. Millar, N. J. A. Sloane and N. E. Young, A new operation on sequences: the Boustrophedon on transform, J. Combin. Theory, 17A 44-54 1996 (Abstract, pdf, ps).
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FORMULA
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a(n)=sum_{i=0,1,2..,n) binomial(n,i)*A000831(n-i). - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Nov 19 2006
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MAPLE
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A000834 := exp(x)*(sin(x)+cos(x))/(cos(x)-sin(x)) : for n from 0 to 200 do printf("%d %d ", n, n!*coeftayl(A000834, x=0, n)) ; end: - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Nov 19 2006
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CROSSREFS
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Sequence in context: A034428 A101880 A107894 this_sequence A005346 A129094 A059424
Adjacent sequences: A000831 A000832 A000833 this_sequence A000835 A000836 A000837
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KEYWORD
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nonn
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AUTHOR
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njas
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