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Search: id:A109577
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| A109577 |
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E.g.f.: 2x/[1-exp(-2x)+2exp(-x)]. |
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+0
1
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| 0, 1, 0, 3, -12, 65, -450, 3577, -32424, 331137, -3757350, 46892681, -638447436, 9416929249, -149581289130, 2545707159465, -46213451575248, 891368532889601, -18204123410896590, 392431030262264329, -8904987308885931060, 212174197452256551393, -5296088301994320448530
(list; graph; listen)
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OFFSET
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0,4
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MAPLE
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G:=2*x/(1-exp(-2*x)+2*exp(-x)): Gser:=series(G, x=0, 26): 0, seq(n!*coeff(Gser, x^n), n=1..23); # yields the signed sequence
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MATHEMATICA
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g[x_] = x/(-1 + Exp[ -2*x] - 2*Exp[ -x]) h[x_, n_] = Dt[g[x], {x, n}] a[x_] = Table[h[x, n], {n, 0, 50}]; b = 2*a[0]
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CROSSREFS
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Sequence in context: A029851 A111262 A139134 this_sequence A007017 A082987 A086836
Adjacent sequences: A109574 A109575 A109576 this_sequence A109578 A109579 A109580
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KEYWORD
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sign
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AUTHOR
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Roger L. Bagula (rlbagulatftn(AT)yahoo.com), Jun 28 2005
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