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A009301
E.g.f. exp(x/cosh(x)).
1
1, 1, 1, -2, -11, -4, 181, 624, -3863, -37808, 66121, 2529440, 4478365, -197245632, -1211701763, 17275207936, 226423491793, -1517532372736, -43068302925551, 78275049887232, 8876725117679941, 24598365340871680, -1997577117130009403, -16151599386896207872, 483811389670392875449
OFFSET
0,4
MATHEMATICA
With[{nn=30}, CoefficientList[Series[Exp[x/Cosh[x]], {x, 0, nn}], x] Range[ 0, nn]!] (* Harvey P. Dale, Jan 26 2016 *)
PROG
(PARI)
N=33; x='x+O('x^N);
egf=exp(x*1/cosh(x));
Vec(serlaplace(egf))
/* Joerg Arndt, Sep 15 2012 */
CROSSREFS
Sequence in context: A152985 A257112 A077272 * A087552 A124688 A339807
KEYWORD
sign,easy
AUTHOR
EXTENSIONS
Extended with signs by Olivier Gérard, Mar 15 1997
STATUS
approved