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A012996 sech(arctan(x)+arcsin(x))=1-4/2!*x^2+88/4!*x^4-5110/6!*x^6... 0
1, -4, 88, -5110, 553160, -96580250, 24721393700, -8728515353350, 4063560953062000, -2412185091080859250, 1778146182982493577500, -1593628484999043797378750, 1706481881516410825432385000 (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: A012946 A013101 A013067 * A195373 A065754 A244013

Adjacent sequences:  A012993 A012994 A012995 * A012997 A012998 A012999

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified November 19 16:06 EST 2019. Contains 329320 sequences. (Running on oeis4.)