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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 Table of n, a(n) for n=0..14. 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 Adjacent sequences: A048603 A048604 A048605 * A048607 A048608 A048609 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.)