login
A027406
Number of labeled servers of dimension 19.
1
1, 19, 532, 18544, 758974, 35337226, 1833202384, 104409838312, 6456768305884, 429818796312724, 30587559391254736, 2313781261593170464, 185160727825248627112, 15612253234853491025464
OFFSET
0,2
LINKS
R. Donaghey, Binomial self-inverse sequences and tangent coefficients, J. Combin. Theory, Series A, 21 (1976), 155-163.
FORMULA
E.g.f.: exp( sum( ((1+x)^i-1)/i, i=1..19 ) ).
MATHEMATICA
Table[n!*SeriesCoefficient[E^(Sum[((1+x)^i - 1)/i, {i, 1, 19}]), {x, 0, n}], {n, 0, 20}] (* Vincenzo Librandi, Jan 01 2013 *)
CROSSREFS
Sequence in context: A057644 A283382 A196512 * A053116 A309313 A158211
KEYWORD
nonn
STATUS
approved