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Search: id:A048602
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| A048602 |
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Numerators of coefficients in function a(x) such that a(a(x)) = sin x. |
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+0
11
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| 1, -1, -1, -53, -23, -92713, -742031, 594673187, 329366540401, 104491760828591, 1508486324285153, -582710832978168221, -1084662989735717135537, -431265609837882130202597, 784759327625761394688977441
(list; graph; listen)
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OFFSET
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0,4
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COMMENT
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Recursion exists for coefficients, but is too complicated to process without computer algebra system
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REFERENCES
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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
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x - x^3/12 - x^5/160 ...
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CROSSREFS
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Cf. A048603. Apart from signs, the same sequence as A048606.
Sequence in context: A143294 A143428 A143385 this_sequence A048606 A033373 A104936
Adjacent sequences: A048599 A048600 A048601 this_sequence A048603 A048604 A048605
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KEYWORD
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frac,sign,nice
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AUTHOR
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Winston C. Yang (yang(AT)math.wisc.edu)
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