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A012255 exp(tanh(arcsin(x)))=1+x+1/2!*x^2-3/4!*x^4-4/5!*x^5+21/6!*x^6... 0
1, 1, 1, 0, -3, -4, 21, 136, 185, 272, 9641, 222016, 1668021, 21267520, 192801597, 3836913536, 42064398961, 874251520256, 10576096455505, 254117293340672, 3476312353756781, 92635637659667456 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,5

LINKS

Table of n, a(n) for n=0..21.

CROSSREFS

Sequence in context: A081698 A182096 A012123 * A012247 A057791 A167452

Adjacent sequences:  A012252 A012253 A012254 * A012256 A012257 A012258

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified June 15 17:43 EDT 2019. Contains 324142 sequences. (Running on oeis4.)