A009653 - OEIS

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A009653

Expansion of tan(ln(1+x)/cosh(x)).

0, 1, -1, 1, -12, 55, -255, 2679, -23632, 201245, -2409525, 30433181, -383307804, 5609915779, -89478694851, 1470425213763, -26173709472960, 501554172182201, -10043883092049993, 212501921779526329, -4764376768067195020 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,5`
	MATHEMATICA	`Tan[ Log[ 1+x ]/Cosh[ x ] ]`
	CROSSREFS	`Sequence in context: A009726 A190948 A143856 * A133001 A104188 A069552` `Adjacent sequences: A009650 A009651 A009652 * A009654 A009655 A009656`
	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 14 23:53 EST 2012. Contains 205689 sequences.