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%I #14 Jun 01 2014 10:08:42
%S 1,18,477,15726,608499,26775630,1312423155,70609087530,4123848816585,
%T 259217370402930,17415882628886925,1243604250827128350,
%U 93931364648982616875,7474399697415548199150,624407709783640239540675
%N Number of labeled servers of dimension 18.
%H Vincenzo Librandi, <a href="/A027405/b027405.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..18 ) ).
%t Table[n!*SeriesCoefficient[E^(Sum[((1+x)^i - 1)/i, {i, 1, 18}]), {x, 0, n}], {n, 0, 20}] (* _Vincenzo Librandi_, Jan 01 2013 *)
%K nonn
%O 0,2
%A _Olivier Gérard_
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