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Search: id:A012171
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A012171 arctanh(tan(tanh(x)))=x+2/3!*x^3+16/5!*x^5+496/7!*x^7+24064/9!*x^9... +0
1
1, 2, 16, 496, 24064, 1908224, 227958784, 36620830720, 7865201852416, 2142236553248768, 725477781101608960, 298762982193334583296, 146937839959786186080256, 85124605007437662078894080 (list; graph; listen)
OFFSET

0,2
CROSSREFS

Sequence in context: A140309 A012461 A012458 this_sequence A068472 A140310 A140311

Adjacent sequences: A012168 A012169 A012170 this_sequence A012172 A012173 A012174

KEYWORD

nonn

AUTHOR

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

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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