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A027391
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Number of labeled servers of dimension 4.
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1
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1, 4, 22, 144, 1074, 8904, 80676, 789408, 8267436, 92024496, 1082549736, 13396319424, 173709100152, 2352429994464, 33175988457264, 486025859896704, 7380209439505296, 115932434008477248
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OFFSET
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0,2
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LINKS
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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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MATHEMATICA
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Table[n! * SeriesCoefficient[E^((x * (48 + 36 * x + 16 * x^2 + 3 * x^3))/12), {x, 0, n}], {n, 0, 20}] (* Vincenzo Librandi, Dec 31 2012 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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