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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
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OFFSET
0,2
LINKS
Table of n, a(n) for n=0..13.
CROSSREFS
Sequence in context:
A008793
A361297
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 March 28 08:02 EDT 2024. Contains 371236 sequences. (Running on oeis4.)