%I #13 Jun 01 2014 02:14:38

%S 1,6,51,526,6261,83670,1232335,19742190,340632825,6281417350,

%T 123031916475,2546554829550,55463580338125,1266494279875350,

%U 30225798507297975,751874518736980750,19447447965603896625

%N Number of labeled servers of dimension 6.

%H Vincenzo Librandi, <a href="/A027393/b027393.txt">Table of n, a(n) for n = 0..200</a>

%H R. Donaghey, <a href="http://dx.doi.org/10.1016/0097-3165(76)90060-1">Binomial self-inverse sequences and tangent coefficients</a>, J. Combin. Theory, Series A, 21 (1976), 155-163.

%F E.g.f.: exp( (x*(360 + 450*x + 400*x^2 + 225*x^3 + 72*x^4 + 10*x^5))/60 ).

%t Table[n!*SeriesCoefficient[E^((x * (360 + 450 * x + 400 * x^2 + 225 * x^3 + 72 * x^4 + 10 * x^5))/60), {x, 0, n}],{n, 0, 20}] (* _Vincenzo Librandi_, Dec 31 2012 *)

%K nonn

%O 0,2

%A _Olivier Gérard_