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Search: id:A027390
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| A027390 |
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Number of labeled servers of dimension 3. |
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+0
1
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| 1, 3, 12, 56, 294, 1698, 10624, 71256, 508188, 3829652, 30340464, 251647872, 2177440648, 19596586584, 182967013056, 1768251873632, 17653554391056, 181748836240944, 1926542292294592, 20996051677557888
(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[ (x*(18 + 9*x + 2*x^2))/6 ]
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CROSSREFS
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Sequence in context: A120921 A074533 A000257 this_sequence A009499 A009656 A020016
Adjacent sequences: A027387 A027388 A027389 this_sequence A027391 A027392 A027393
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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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