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A009521 Expansion of sin(tanh(tan(x))). 0
1, -1, -7, 55, 2897, -5105, -7252983, -341550201, 43255573537, 11238852308639, 963068748879257, -153386988236833449, -82902651997417876879, -17679532127297031010385, -779530123182446522616663 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..14.

MATHEMATICA

Sin[ Tanh[ Tan[ x ] ]] (* Odd Part *)

CROSSREFS

Sequence in context: A055056 A305282 A197228 * A116120 A056719 A038855

Adjacent sequences:  A009518 A009519 A009520 * A009522 A009523 A009524

KEYWORD

sign

AUTHOR

R. H. Hardin

EXTENSIONS

Extended with signs by Olivier Gérard, Mar 15 1997

STATUS

approved

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Last modified March 18 13:47 EDT 2019. Contains 321289 sequences. (Running on oeis4.)