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A027390 Number of labeled servers of dimension 3. 0
1, 3, 12, 56, 294, 1698, 10624, 71256, 508188, 3829652, 30340464, 251647872, 2177440648, 19596586584, 182967013056, 1768251873632, 17653554391056, 181748836240944, 1926542292294592, 20996051677557888 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

REFERENCES

R. Donaghey, Binomial self-inverse sequences and tangent coefficients, J. Combin. Theory, Series A, 21 (1976), 155-163.

FORMULA

E.g.f.: Exp[ (x*(18 + 9*x + 2*x^2))/6 ]

CROSSREFS

Sequence in context: A074533 A000257 A180256 * A009499 A009656 A020016

Adjacent sequences:  A027387 A027388 A027389 * A027391 A027392 A027393

KEYWORD

nonn

AUTHOR

Olivier Gerard (olivier.gerard(AT)gmail.com)

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Last modified February 17 10:57 EST 2012. Contains 206009 sequences.