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A013008
sech(arctan(x)+tan(x))=1-4/2!*x^2+80/4!*x^4-4384/6!*x^6+451328/8!*x^8...
0
1, -4, 80, -4384, 451328, -74726784, 18162914304, -6087614197760, 2690808196562944, -1516485688823611392, 1061352718471077658624, -903110171035290053246976, 918161695966849718656434176
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OFFSET
0,2
LINKS
Table of n, a(n) for n=0..12.
CROSSREFS
Sequence in context:
A012042
A013139
A013007
*
A013180
A322751
A000316
Adjacent sequences:
A013005
A013006
A013007
*
A013009
A013010
A013011
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved
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Last modified August 6 10:33 EDT 2024. Contains 374969 sequences. (Running on oeis4.)
