A027406 Number of labeled servers of dimension 19.

1, 19, 532, 18544, 758974, 35337226, 1833202384, 104409838312, 6456768305884, 429818796312724, 30587559391254736, 2313781261593170464, 185160727825248627112, 15612253234853491025464

Offset

0,2

Links

Vincenzo Librandi, Table of n, a(n) for n = 0..200

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

Adjacent sequences: A027403 A027404 A027405 * A027407 A027408 A027409

Keyword

nonn

Author

Olivier Gérard

Status

approved