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A012667 Expansion of sin(tanh(x)*tan(x)). 2
2, -8, -159328, -1254489728, -20109957303808, -562928915963168768, -18213125504516311441408, 1487241135313514473061711872, 1254993904880106790594284355715072 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..8.

FORMULA

G.f.: sin(tanh(x)*tan(x)).

EXAMPLE

sin(tanh(x)*tan(x)) = 2/2!*x^2-8/6!*x^6-159328/10!*x^10...

MATHEMATICA

Sin[ Tanh[ x ]*Tan[ x ] ] (* [ x^(4n+2) ] *)

CROSSREFS

Sequence in context: A081979 A012672 A024340 * A124075 A260548 A019315

Adjacent sequences: A012664 A012665 A012666 * A012668 A012669 A012670

KEYWORD

sign

AUTHOR

Patrick Demichel (patrick.demichel(AT)hp.com)

STATUS

approved

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Last modified January 30 21:42 EST 2023. Contains 359947 sequences. (Running on oeis4.)