A009639 - OEIS

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A009639

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

0, 1, -1, 6, -26, 206, -1666, 17476, -201256, 2686856, -39501256, 644639696, -11460605936, 221416107056, -4607717991696, 102865898480416, -2450540846322816, 62064658738621056, -1664916515878596736 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,4`
	MATHEMATICA	`Tan[ Log[ 1+Tan[ x ] ] ]`
	CROSSREFS	`Sequence in context: A103649 A053946 A027283 * A199591 A137088 A179162` `Adjacent sequences: A009636 A009637 A009638 * A009640 A009641 A009642`
	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 14:50 EST 2012. Contains 206050 sequences.