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A027391 Number of labeled servers of dimension 4. 1
1, 4, 22, 144, 1074, 8904, 80676, 789408, 8267436, 92024496, 1082549736, 13396319424, 173709100152, 2352429994464, 33175988457264, 486025859896704, 7380209439505296, 115932434008477248 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..200

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

FORMULA

E.g.f.: exp( (x*(48 + 36*x + 16*x^2 + 3*x^3))/12 ).

MATHEMATICA

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 *)

CROSSREFS

Sequence in context: A045744 A243626 A104991 * A134988 A081002 A222012

Adjacent sequences:  A027388 A027389 A027390 * A027392 A027393 A027394

KEYWORD

nonn

AUTHOR

Olivier Gérard

STATUS

approved

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Last modified July 6 23:56 EDT 2020. Contains 335484 sequences. (Running on oeis4.)