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Search: id:A068556
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| A068556 |
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From numerators in expansion of tan(arcsinh(x)) - sin(arctanh(x)). |
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+0
2
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| 0, 0, 0, 0, 4, 4, 377, 1202, 133211, 1082357, 3730351411, 6203235575, 28719995819965, 2124563380903465, 122827509141846335, 42344667805954043, 1305035883448960477, 36723101348641621053659, 384279850938174722635253, 71260765129276904394438865
(list; graph; listen)
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OFFSET
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0,5
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REFERENCES
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R. W. Gosper, personal communication, Mar 07, 2002, who asks if the coefficients are always nonnegative.
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EXAMPLE
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4/189*x^8+4/189*x^10+377/12474*x^12+1202/43659*x^14+...
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CROSSREFS
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Cf. A068557.
Sequence in context: A063439 A107052 A000790 this_sequence A078243 A024246 A024247
Adjacent sequences: A068553 A068554 A068555 this_sequence A068557 A068558 A068559
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KEYWORD
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nonn,frac
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Mar 23 2002
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