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A013429 sech(arcsin(x)-tanh(x))=1-90/6!*x^6+1176/8!*x^8-185094/10!*x^10... 0
1, 0, 0, -90, 1176, -185094, 6953628, -2271831562, 113771489552, -90523142172238, 2740534463632996, -9209167403962507058, -464269042403340299048, -2066044589238157561264950 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..13.

CROSSREFS

Sequence in context: A013427 A013425 A013428 * A008449 A213455 A155016

Adjacent sequences:  A013426 A013427 A013428 * A013430 A013431 A013432

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified December 14 01:03 EST 2019. Contains 329977 sequences. (Running on oeis4.)