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Search: id:A027407
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| A027407 |
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Number of labeled servers of dimension 20. |
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+0
1
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| 1, 20, 590, 21680, 935770, 45961096, 2515881220, 151228367840, 9871829559980, 693789631115120, 52132594993215496, 4164523150393491520, 351983138874505854040, 31348448683850114451680
(list; graph; listen)
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OFFSET
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0,2
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REFERENCES
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R. Donaghey, Binomial self-inverse sequences and tangent coefficients, J. Combin. Theory, Series A, 21 (1976), 155-163.
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FORMULA
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E.g.f.: Exp[ Sum[ ((1+x)^i-1)/i, {i, 1, 20} ] ]
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CROSSREFS
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Adjacent sequences: A027404 A027405 A027406 this_sequence A027408 A027409 A027410
Sequence in context: A130033 A047682 A012568 this_sequence A116218 A035279 A015268
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KEYWORD
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nonn
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AUTHOR
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Olivier Gerard (olivier.gerard(AT)gmail.com)
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