A027409 Number of labeled servers of dimension 22.

1, 22, 715, 28974, 1380093, 74841558, 4525209711, 300561720030, 21686284145097, 1685085369468534, 140028734022344739, 12373253024424889518, 1157017818664396423845, 114029077860692830245366

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..22 ) ).

Mathematica

Table[n!*SeriesCoefficient[E^(Sum[((1+x)^i - 1)/i, {i, 1, 22}]), {x, 0, n}], {n, 0, 20}] (* Vincenzo Librandi, Jan 01 2013 *)

Crossrefs

Sequence in context: A025760 A229124 A262417 * A159189 A067768 A181181

Adjacent sequences: A027406 A027407 A027408 * A027410 A027411 A027412

Keyword

nonn

Author

Olivier Gérard

Status

approved