id:A009640 - OEIS Search Results

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Expansion of tan(ln(1+tanh(x))).

+0
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0, 1, -1, 2, -10, 46, -226, 1532, -11880, 96136, -882376, 9179312, -102310000, 1223945776, -15941391376, 222827194592, -3303846357120, 52077034777216, -871329939918976, 15375474411183872, -285315305595562240 (list; graph; listen)

	OFFSET	`0,4`
	MATHEMATICA	`Tan[ Log[ 1+Tanh[ x ] ] ]`
	CROSSREFS	`Sequence in context: A006213 A137635 A029706 this_sequence A081167 A166107 A034429` `Adjacent sequences: A009637 A009638 A009639 this_sequence A009641 A009642 A009643`
	KEYWORD	`sign,easy`
	AUTHOR	`R. H. Hardin (rhhardin(AT)att.net)`
	EXTENSIONS	`Extended with signs Mar 15 1997 by Olivier Gerard.`

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Last modified December 7 08:40 EST 2009. Contains 170430 sequences.

AT&T Labs Research