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A048606
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Numerators of coefficients in function a(x) such that a(a(x)) = sinh x.
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2
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1, 1, -1, 53, -23, 92713, -742031, -594673187, 329366540401, -104491760828591, 1508486324285153, 582710832978168221, -1084662989735717135537, 431265609837882130202597, 784759327625761394688977441
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,4
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COMMENTS
| Recursion exists for coefficients, but is too complicated to use without a computer algebra system
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REFERENCES
| W. C. Yang, Polynomials are essentially integer partitions, preprint, 1999
W. C. Yang, Composition equations, preprint, 1999
W. C. Yang, Derivatives are essentially integer partitions, Discrete Math., 222 (2000), 235-245.
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EXAMPLE
| x + x^3/12 - x^5/160 + ...
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CROSSREFS
| Cf. A048603. Apart from signs, the same sequence as A048602.
Sequence in context: A143428 A143385 A048602 * A033373 A171132 A104936
Adjacent sequences: A048603 A048604 A048605 * A048607 A048608 A048609
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KEYWORD
| frac,sign,nice
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AUTHOR
| Winston C. Yang (yang(AT)math.wisc.edu)
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