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A012339
E.g.f.: sech(arcsin(x)*sin(x))=1-12/4!*x^4+6160/8!*x^8-120960/10!*x^10...
1
1, 0, -12, 0, 6160, -120960, -30419136, 720079360, 289764450560, -67943999090688, -22346350979320832, 79039716551606272, -455312101897953210368, -1387404550704064289013760, -763348964181211012935499776, -349778941309176227928741642240
OFFSET
0,3
LINKS
MATHEMATICA
With[{nn=40}, Take[CoefficientList[Series[Sech[ArcSin[x]Sin[x]], {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] Harvey P. Dale, May 17 2012
CROSSREFS
Sequence in context: A120954 A265087 A012337 * A012448 A012338 A012453
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
EXTENSIONS
Definition clarified by and more terms from Harvey P. Dale, May 17 2012
STATUS
approved