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A013165
sec(arctanh(x)+log(x+1))=1+4/2!*x^2-6/3!*x^3+115/4!*x^4-500/5!*x^5...
0
1, 0, 4, -6, 115, -500, 8830, -70770, 1316825, -15886440, 324218600, -5249917750, 119185529675, -2412502361100, 61104527105050, -1476059511449250, 41607421213320625, -1162370434739930000
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OFFSET
0,3
LINKS
Table of n, a(n) for n=0..17.
CROSSREFS
Sequence in context:
A012909
A219507
A012934
*
A337466
A052672
A137025
Adjacent sequences:
A013162
A013163
A013164
*
A013166
A013167
A013168
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved
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Last modified May 29 11:55 EDT 2023. Contains 363042 sequences. (Running on oeis4.)