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A012923 sech(arcsin(x)+sin(x))=1-4/2!*x^2+80/4!*x^4-4024/6!*x^6+373376/8!*x^8... 0
1, -4, 80, -4024, 373376, -55810464, 12218736768, -3690395100032, 1469402675519488, -746064489482211840, 470375829415840688128, -360567791801354924107776, 330231250494338680414994432 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..12.

CROSSREFS

Sequence in context: A102063 A002436 A013031 * A012922 A013090 A012042

Adjacent sequences: A012920 A012921 A012922 * A012924 A012925 A012926

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified January 30 22:45 EST 2023. Contains 359947 sequences. (Running on oeis4.)