# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/ Search: id:a027405 Showing 1-1 of 1 %I A027405 #14 Jun 01 2014 10:08:42 %S A027405 1,18,477,15726,608499,26775630,1312423155,70609087530,4123848816585, %T A027405 259217370402930,17415882628886925,1243604250827128350, %U A027405 93931364648982616875,7474399697415548199150,624407709783640239540675 %N A027405 Number of labeled servers of dimension 18. %H A027405 Vincenzo Librandi, Table of n, a(n) for n = 0..200 %H A027405 R. Donaghey, Binomial self-inverse sequences and tangent coefficients, J. Combin. Theory, Series A, 21 (1976), 155-163. %F A027405 E.g.f.: exp( sum( ((1+x)^i-1)/i, i=1..18 ) ). %t A027405 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 A027405 nonn %O A027405 0,2 %A A027405 _Olivier Gérard_ # Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE