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A009639 Expansion of tan(ln(1+tan(x))). 0
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.