A012327 - OEIS

A012327

sech(arcsin(x)*exp(x))=1-1/2!*x^2-6/3!*x^3-23/4!*x^4-20/5!*x^5...

1, 0, -1, -6, -23, -20, 695, 8750, 59057, 27096, -6378545, -112547358, -1027909159, 1643389124, 273544780743, 5934532973590, 63673713397473, -375014334859344, -35324004296221921, -878127940239307318

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,4

LINKS

Table of n, a(n) for n=0..19.

MATHEMATICA

With[{nn=20}, CoefficientList[Series[Sech[ArcSin[x]Exp[x]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Oct 25 2011 *)

CROSSREFS

Sequence in context: A062818 A154079 A160633 * A012523 A154817 A279797

Adjacent sequences: A012324 A012325 A012326 * A012328 A012329 A012330

KEYWORD

sign

AUTHOR

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

STATUS

approved