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A009557 Expansion of e.g.f. sin(x)/cosh(log(1+x)). 1
0, 1, 0, -4, 12, -19, -60, 818, -4872, 14401, 75240, -1619696, 14470500, -61780211, -451892532, 13265310134, -158017858320, 882221413217, 8296746885072, -308498052476476, 4593579141365820, -31680570948622259 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

G. C. Greubel, Table of n, a(n) for n = 0..475

MATHEMATICA

With[{nmax = 50}, CoefficientList[Series[Sin[x]/Cosh[Log[x + 1]], {x, 0, nmax}], x]*Range[0, nmax]!] (* G. C. Greubel, Jan 21 2018 *)

PROG

(PARI) x='x+O('x^30); concat([0], Vec(serlaplace(sin(x)/cosh(log(1+x))))) \\ G. C. Greubel, Jan 21 2018

CROSSREFS

Sequence in context: A301068 A169583 A239727 * A240762 A050021 A239662

Adjacent sequences:  A009554 A009555 A009556 * A009558 A009559 A009560

KEYWORD

sign,easy

AUTHOR

R. H. Hardin

EXTENSIONS

Extended with signs by Olivier Gérard, Mar 15 1997

STATUS

approved

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Last modified September 22 17:35 EDT 2019. Contains 327311 sequences. (Running on oeis4.)