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A009215 Expansion of e.g.f.: exp(sin(x)/cosh(x)). 0
1, 1, 1, -3, -15, -3, 297, 1113, -6783, -77063, 70609, 5509845, 18558705, -430006731, -4027228359, 33282260529, 727421677185, -1454472663311, -134584692783455, -448480622503635, 26232888936219249, 254015086363619949 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..21.

MATHEMATICA

With[{nn=30}, CoefficientList[Series[Exp[Sin[x]/Cosh[x]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Sep 26 2016 *)

CROSSREFS

Sequence in context: A048568 A119678 A096682 * A274078 A088558 A212203

Adjacent sequences:  A009212 A009213 A009214 * A009216 A009217 A009218

KEYWORD

sign,easy

AUTHOR

R. H. Hardin

EXTENSIONS

Extended with signs by Olivier Gérard, Mar 15 1997

Definition clarified and prior Mathematica program replaced by Harvey P. Dale, Sep 26 2016

STATUS

approved

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Last modified September 23 13:55 EDT 2017. Contains 292358 sequences.