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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: A143385 A231426 A048602 * A033373 A171132 A259091 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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