A009301 E.g.f. exp(x/cosh(x)).

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

Links

Table of n, a(n) for n=0..24.

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

Cf. A009118, A009562.

Sequence in context: A152985 A257112 A077272 * A087552 A124688 A339807

Adjacent sequences: A009298 A009299 A009300 * A009302 A009303 A009304

Keyword

sign,easy

Author

R. H. Hardin

Extensions

Extended with signs by Olivier Gérard, Mar 15 1997

Status

approved