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A012222 exp(arctan(tanh(x)))=1+x+1/2!*x^2-3/3!*x^3-15/4!*x^4+41/5!*x^5... 1
1, 1, 1, -3, -15, 41, 561, -1243, -40415, 58001, 4825121, -1956083, -866056815, -740509639, 218527875281, 509169335477, -73838559553215, -295854887910879, 32207514779999041, 189240977761969437 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..19.

CROSSREFS

Sequence in context: A295938 A096742 A012256 * A069267 A059270 A219085

Adjacent sequences:  A012219 A012220 A012221 * A012223 A012224 A012225

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified March 23 10:55 EDT 2019. Contains 321424 sequences. (Running on oeis4.)