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A013387 sech(sin(x)-tanh(x))=1-10/6!*x^6+840/8!*x^8-60870/10!*x^10... 0
1, 0, 0, -10, 840, -60870, 5042180, -535134730, 75998689520, -14286917494990, 3407940125324860, -990760306939592050, 342314173738467052200, -138600427075503715528310, 65139256364305112582847540 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

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

CROSSREFS

Sequence in context: A013386 A013385 A013383 * A013438 A013434 A013436

Adjacent sequences:  A013384 A013385 A013386 * A013388 A013389 A013390

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified January 22 05:19 EST 2022. Contains 350481 sequences. (Running on oeis4.)