A027400 Number of labeled servers of dimension 13.

1, 13, 247, 5811, 159939, 4993911, 173345913, 6593244957, 271829934441, 12046090972149, 569908578269511, 28625770524756483, 1519419921487859547, 84887883112007162511, 4974828151748224390569, 304918429757614547396301

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..13 ) ).

Mathematica

Table[n!*SeriesCoefficient[E^(Sum[((1+x)^i - 1)/i, {i, 1, 13}]), {x, 0, n}], {n, 0, 20}] (* Vincenzo Librandi, Dec 31 2012 *)

Crossrefs

Sequence in context: A203156 A049665 A196665 * A053100 A320308 A219059

Adjacent sequences: A027397 A027398 A027399 * A027401 A027402 A027403

Keyword

nonn

Author

Olivier Gérard

Status

approved