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Search: id:A027391
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| A027391 |
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Number of labeled servers of dimension 4. |
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+0
1
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| 1, 4, 22, 144, 1074, 8904, 80676, 789408, 8267436, 92024496, 1082549736, 13396319424, 173709100152, 2352429994464, 33175988457264, 486025859896704, 7380209439505296, 115932434008477248
(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*(48 + 36*x + 16*x^2 + 3*x^3))/12 ]
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CROSSREFS
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Sequence in context: A077056 A045744 A104991 this_sequence A134988 A081002 A057834
Adjacent sequences: A027388 A027389 A027390 this_sequence A027392 A027393 A027394
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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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