A009125 - OEIS

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A009125

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

1, 0, 1, -3, 20, -120, 976, -8568, 88640, -1011840, 12933376, -180964608, 2767631360, -45799004160, 816582578176, -15594628021248, 317710534983680, -6876762625966080, 157606194409701376, -3812723805066559488 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,4`
	MATHEMATICA	`Cosh[ Log[ 1+Tan[ x ] ] ]`
	CROSSREFS	`Sequence in context: A128910 A037788 A037669 * A037795 A187442 A167590` `Adjacent sequences: A009122 A009123 A009124 * A009126 A009127 A009128`
	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 12:38 EST 2012. Contains 206021 sequences.