%I #14 Jun 01 2014 11:16:22
%S 1,23,782,33166,1653884,93917924,5947476712,413793483368,
%T 31278776664224,2546554728018016,221748772939284416,
%U 20534447545911194048,2012485449681377005312,207891800652614878059776
%N Number of labeled servers of dimension 23.
%H Vincenzo Librandi, <a href="/A027410/b027410.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( sum( ((1+x)^i-1)/i, i=1..23 ) ).
%t Table[n!*SeriesCoefficient[E^(Sum[((1+x)^i - 1)/i, {i, 1, 23}]), {x, 0, n}], {n, 0, 20}] (* _Vincenzo Librandi_, Jan 01 2013 *)
%K nonn
%O 0,2
%A _Olivier GĂ©rard_
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