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A012790 tanh(sec(x)*arcsin(x))=x+2/3!*x^3-20/5!*x^5-1104/7!*x^7-23728/9!*x^9... 0
1, 2, -20, -1104, -23728, 2048224, 394518592, 28921612032, -3968669081344, -2038929577444864, -347998546570798080, 59058720637105172480, 67936182152875665510400, 22515279368057454566531072 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..13.

CROSSREFS

Sequence in context: A158843 A008793 A015192 * A273194 A013144 A239642

Adjacent sequences:  A012787 A012788 A012789 * A012791 A012792 A012793

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified November 17 13:33 EST 2019. Contains 329230 sequences. (Running on oeis4.)