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A048606 Numerators of coefficients in function a(x) such that a(a(x)) = sinh(x). 2
1, 1, -1, 53, -23, 92713, -742031, -594673187, 329366540401, -104491760828591, 1508486324285153, 582710832978168221, -1084662989735717135537, 431265609837882130202597, 784759327625761394688977441 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,4
COMMENTS
A recursion exists for coefficients, but is too complicated to use without a computer algebra system.
REFERENCES
W. C. Yang, Polynomials are essentially integer partitions, preprint, 1999
W. C. Yang, Composition equations, preprint, 1999
LINKS
W. C. Yang, Derivatives are essentially integer partitions, Discrete Math., 222 (2000), 235-245.
EXAMPLE
x + x^3/12 - x^5/160 + ...
CROSSREFS
Cf. A048603. Apart from signs, the same sequence as A048602.
Sequence in context: A298633 A298710 A048602 * A033373 A289237 A319904
KEYWORD
frac,sign,nice
AUTHOR
Winston C. Yang (yang(AT)math.wisc.edu)
STATUS
approved

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Last modified April 17 01:50 EDT 2024. Contains 371756 sequences. (Running on oeis4.)