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A013114 sech(arcsinh(x)+arctan(x))=1-4/2!*x^2+104/4!*x^4-6790/6!*x^6... 0
1, -4, 104, -6790, 827480, -162019450, 46518314300, -18413421592150, 9610889961530000, -6395770003655763250, 5285420552751908562500, -5310341702734086669088750, 6374725468204682712703775000 (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: A012958 A012984 A202683 * A281430 A158114 A082736

Adjacent sequences:  A013111 A013112 A013113 * A013115 A013116 A013117

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified February 16 21:26 EST 2020. Contains 331975 sequences. (Running on oeis4.)