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A012876 sec(sech(x)*log(x+1))=1+1/2!*x^2-3/3!*x^3+4/4!*x^4-40/5!*x^5... 0
1, 0, 1, -3, 4, -40, 370, -2100, 19052, -224712, 2295380, -27161420, 388309832, -5572831680, 85093639488, -1453531202760, 26088826973648, -491011275101888, 9922199896825168, -211576194636993072 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..19.

CROSSREFS

Sequence in context: A032836 A167760 A012472 * A300882 A348225 A172144

Adjacent sequences:  A012873 A012874 A012875 * A012877 A012878 A012879

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified May 19 08:11 EDT 2022. Contains 353826 sequences. (Running on oeis4.)