A013029 E.g.f. (in x^2) is arctan(sinh(x)+sin(x))

2, -16, 770, -92496, 20740610, -7474383376, 3950577954050, -2879011223666256, 2766724614020441090, -3389992164431254725136, 5158145935254382213801730, -9542165281823577542150984016

Offset

0,1

Links

Table of n, a(n) for n=0..11.

Mathematica

Partition[CoefficientList[Series[ArcTan[Sinh[x] + Sin[x]], {x, 0, 23}], x]*Range[0, 23]!, 2][[All, 2]]

Prog

(PARI) x='x+O('x^33) /* That many terms */
v=Vec(serlaplace(atan(sin(x)+sinh(x)))); /* every second term is zero */
vector(#v\2, n, v[2*n-1]) /* show terms */
/* Joerg Arndt, Mar 16 2011 */

Crossrefs

Sequence in context: A005118 A108400 A186002 * A012915 A012920 A013088

Adjacent sequences: A013026 A013027 A013028 * A013030 A013031 A013032

Keyword

sign

Author

Patrick Demichel (patrick.demichel(AT)hp.com)

Status

approved