A009780 - OEIS

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A009780

Expansion of tanh(ln(1+x))/cos(x).

0, 1, -1, 3, 0, -5, 105, -203, 392, 16245, -117765, 957671, -385176, -34555105, 764774101, -4852910775, 9796998000, 823102605865, -13347886241385, 158552006816779, -178014612138640, -21779819623624125, 605833151606624865 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,4`
	MATHEMATICA	`Tanh[ Log[ 1+x ] ]/Cos[ x ]`
	CROSSREFS	`Sequence in context: A088521 A022837 A088969 * A175677 A129502 A099892` `Adjacent sequences: A009777 A009778 A009779 * A009781 A009782 A009783`
	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 February 17 00:09 EST 2012. Contains 205978 sequences.