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A009173 Expansion of cosh(tanh(x)*tan(x)). 0
1, 12, 7952, 31111872, 414147567872, 13936708915940352, 987956358173680013312, 130572314003924554412900352, 29485421729721202391180048924672, 10655360784935131422152244665663619072 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
MATHEMATICA
With[{nn=40}, Take[CoefficientList[Series[Cosh[Tanh[x]*Tan[x]], {x, 0, nn}], x] Range[0, nn]!, {1, -1, 4}]] (* Harvey P. Dale, Aug 19 2020 *)
CROSSREFS
Sequence in context: A308130 A107251 A201493 * A012531 A013481 A013513
KEYWORD
nonn
AUTHOR
EXTENSIONS
Reformated Mar 15 1997 by Olivier Gérard.
Previous Mathematica program replaced by Harvey P. Dale, Aug 19 2020
STATUS
approved

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Last modified June 24 01:53 EDT 2024. Contains 373661 sequences. (Running on oeis4.)