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A013474
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Expansion of cos(cos(x)-cosh(x)).
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0
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1, -12, 1568, -445632, 76844288, 278739068928, -467851397312512, -2679102291371999232, 13369295760767407751168, 198192229563606535497842688, -1400852802790123139561996419072, -65350779506647538962325382377766912
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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EXAMPLE
| cos(cos(x)-cosh(x))=1-12/4!*x^4+1568/8!*x^8-445632/12!*x^12...
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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))
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CROSSREFS
| Sequence in context: A160490 A015096 A160237 * A013515 A159383 A015011
Adjacent sequences: A013471 A013472 A013473 * A013475 A013476 A013477
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KEYWORD
| sign,easy
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AUTHOR
| Patrick Demichel (dml(AT)hpfrcu03.france.hp.com)
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EXTENSIONS
| More terms from Ralf Stephan (ralf(AT)ark.in-berlin.de), Jan 17 2003
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