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A009617
Expansion of tanh(tan(x))*sin(x)/2.
0
1, 116, 202576, 1557978176, 34206677698816, 1706222428480541696, 167325183704890858786816, 29168516299952885066683006976, 8389219957754997383106354075467776
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OFFSET
0,2
LINKS
Table of n, a(n) for n=0..8.
MATHEMATICA
Sinh[ Tanh[ x ]*Tan[ x ] ]/2 (* [ x^(4n+2) ] *)
CROSSREFS
Cf.
A012671
.
Sequence in context:
A296360
A035814
A284377
*
A201728
A009687
A373582
Adjacent sequences:
A009614
A009615
A009616
*
A009618
A009619
A009620
KEYWORD
nonn
AUTHOR
R. H. Hardin
EXTENSIONS
Extended and signs tested 03/97.
STATUS
approved
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Last modified September 16 07:48 EDT 2024. Contains 375959 sequences. (Running on oeis4.)