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%I #17 Jun 01 2014 03:13:56
%S 1,13,247,5811,159939,4993911,173345913,6593244957,271829934441,
%T 12046090972149,569908578269511,28625770524756483,1519419921487859547,
%U 84887883112007162511,4974828151748224390569,304918429757614547396301
%N Number of labeled servers of dimension 13.
%H Vincenzo Librandi, <a href="/A027400/b027400.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..13 ) ).
%t Table[n!*SeriesCoefficient[E^(Sum[((1+x)^i - 1)/i, {i, 1, 13}]), {x, 0, n}], {n, 0, 20}] (* _Vincenzo Librandi_, Dec 31 2012 *)
%K nonn
%O 0,2
%A _Olivier Gérard_
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