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Search: id:A048604
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| A048604 |
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Denominators of coefficients in function a(x) such that a(a(x)) = arctan x. |
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+0
2
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| 1, 6, 120, 1680, 362880, 7983360, 6227020800, 186810624000, 355687428096000, 121645100408832000, 51090942171709440000, 213653030899875840000, 1723467782592331776000000, 64431180179990249472000000
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OFFSET
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0,2
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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^3/6 + x^5 * 7/120 ...
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CROSSREFS
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Cf. A048605.
Sequence in context: A076234 A066289 A115678 this_sequence A001516 A026337 A065888
Adjacent sequences: A048601 A048602 A048603 this_sequence A048605 A048606 A048607
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KEYWORD
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frac,nonn
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AUTHOR
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Winston C. Yang (yang(AT)math.wisc.edu)
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