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A012696
arctan(tanh(x)*tanh(x))=2/2!*x^2-16/4!*x^4+32/6!*x^6+18944/8!*x^8...
0
2, -16, 32, 18944, -1904128, 41160704, 41418432512, -13226611572736, 1026478445821952, 1419327244545818624, -990157599155377143808, 185269154824838954614784, 314145305969818487050207232
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OFFSET
0,1
LINKS
Table of n, a(n) for n=0..12.
CROSSREFS
Sequence in context:
A279034
A120069
A018975
*
A012392
A009819
A189332
Adjacent sequences:
A012693
A012694
A012695
*
A012697
A012698
A012699
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved
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Last modified May 20 13:41 EDT 2024. Contains 372715 sequences. (Running on oeis4.)