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Search: id:A012230
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A012230 sech(arctan(tanh(x)))=1-1/2!*x^2+21/4!*x^4-1101/6!*x^6+109001/8!*x^8... +0
1
1, -1, 21, -1101, 109001, -17491001, 4139085981, -1355308485701, 586612833746961, -324261948714025201, 222851423174495787941, -186365710421614910029501, 186332939048243649892744921 (list; graph; listen)
OFFSET

0,3
CROSSREFS

Sequence in context: A072678 A012153 A012183 this_sequence A086098 A086875 A012211

Adjacent sequences: A012227 A012228 A012229 this_sequence A012231 A012232 A012233

KEYWORD

sign

AUTHOR

Patrick Demichel (dml(AT)hpfrcu03.france.hp.com)

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Last modified September 5 01:44 EDT 2008. Contains 143476 sequences.

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