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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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..100 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 Adjacent sequences: A012336 A012337 A012338 * A012340 A012341 A012342 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

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Last modified December 9 00:20 EST 2022. Contains 358698 sequences. (Running on oeis4.)