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A013455 sec(tan(x)-tanh(x))=1+160/6!*x^6+261120/10!*x^10+19712000/12!*x^12... 0
1, 0, 0, 160, 0, 261120, 19712000, 1538068480, 557613056000, 72297758064640, 26395258519552000, 9009548633571328000, 3030117499561574400000, 1720760994441294994472960, 838542041341593366036480000 (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: A213695 A224430 A013454 * A013465 A013466 A060675

Adjacent sequences:  A013452 A013453 A013454 * A013456 A013457 A013458

KEYWORD

nonn

AUTHOR

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

STATUS

approved

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Last modified June 25 13:19 EDT 2022. Contains 354851 sequences. (Running on oeis4.)