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A012227 tanh(arctan(tanh(x)))=x-6/3!*x^3+176/5!*x^5-12016/7!*x^7... 1
1, -6, 176, -12016, 1469696, -280971776, 77198422016, -28793654081536, 13988424620507136, -8578076577450295296, 6478101995566379565056, -5906079803365219349037056, 6394716233788355978540875776 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..12.

CROSSREFS

Cf. A101921.

Sequence in context: A134632 A024277 A012177 * A012152 A165928 A024278

Adjacent sequences:  A012224 A012225 A012226 * A012228 A012229 A012230

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified October 18 21:01 EDT 2018. Contains 316325 sequences. (Running on oeis4.)