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 A013474 Expansion of cos(cos(x)-cosh(x)). 0
 1, -12, 1568, -445632, 76844288, 278739068928, -467851397312512, -2679102291371999232, 13369295760767407751168, 198192229563606535497842688, -1400852802790123139561996419072, -65350779506647538962325382377766912 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS EXAMPLE cos(cos(x)-cosh(x))=1-12/4!*x^4+1568/8!*x^8-445632/12!*x^12... MATHEMATICA With[{nn=50}, Take[CoefficientList[Series[Cos[Cos[x]-Cosh[x]], {x, 0, nn}], x] Range[0, nn-2]!, {1, -1, 4}]] (* Harvey P. Dale, May 02 2020 *) PROG (PARI) a(n)=if(n<0, 0, (4*n)!*polcoeff(cos(cos(x+x*O(x^(4*n)))-cosh(x+x*O(x^(4*n)))), 4*n)) CROSSREFS Sequence in context: A271434 A299694 A160237 * A013515 A159383 A015011 Adjacent sequences:  A013471 A013472 A013473 * A013475 A013476 A013477 KEYWORD sign,easy AUTHOR Patrick Demichel (patrick.demichel(AT)hp.com) EXTENSIONS More terms from Ralf Stephan, Jan 17 2003 STATUS approved

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Last modified September 24 17:09 EDT 2020. Contains 337321 sequences. (Running on oeis4.)