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A013548 Numerator of [x^(2n)] of the Taylor series sech(cosec(x)-coth(x))= 1-x^2/72 +221*x^4/31104 +244939*x^6/235146240 +1846213*x^8/13544423424-... 0
1, -1, 221, -244939, 1846213, -526960582373, 23968139993843, -5189795464140757, 36594801159269740631, -16691319229288614334663751, 11409300606349966887237659743, -198510162914463324156683262269 (list; graph; refs; listen; history; internal format)
OFFSET

0,3

CROSSREFS

Sequence in context: A177420 A011816 A048902 * A083958 A083959 A078212

Adjacent sequences:  A013545 A013546 A013547 * A013549 A013550 A013551

KEYWORD

sign,frac

AUTHOR

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

EXTENSIONS

Values replaced by numerators. - R. J. Mathar, Dec 21 2011

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Last modified February 16 21:30 EST 2012. Contains 205971 sequences.