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A012473 sech(cos(x)*log(x+1))=1-1/2!*x^2+3/3!*x^3+6/4!*x^4-60/5!*x^5... 0
1, 0, -1, 3, 6, -60, 0, 2310, -10752, -84168, 1152240, 2453880, -154467192, 797768400, 16907851688, -250017997320, -1746679208128, 77446551835648, -318565680255360, -18241668233387712, 262053618149070080 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..20.

CROSSREFS

Sequence in context: A303351 A067610 A067609 * A058161 A012877 A103066

Adjacent sequences:  A012470 A012471 A012472 * A012474 A012475 A012476

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified December 8 14:38 EST 2019. Contains 329865 sequences. (Running on oeis4.)