A027405 Number of labeled servers of dimension 18.

1, 18, 477, 15726, 608499, 26775630, 1312423155, 70609087530, 4123848816585, 259217370402930, 17415882628886925, 1243604250827128350, 93931364648982616875, 7474399697415548199150, 624407709783640239540675

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..18 ) ).

Mathematica

Table[n!*SeriesCoefficient[E^(Sum[((1+x)^i - 1)/i, {i, 1, 18}]), {x, 0, n}], {n, 0, 20}] (* Vincenzo Librandi, Jan 01 2013 *)

Crossrefs

Sequence in context: A084273 A230587 A281161 * A282477 A116176 A035023

Adjacent sequences: A027402 A027403 A027404 * A027406 A027407 A027408

Keyword

nonn

Author

Olivier Gérard

Status

approved