A027399 Number of labeled servers of dimension 12.

1, 12, 210, 4544, 114918, 3294600, 104940100, 3660744000, 138361492380, 5618752289360, 243511994967000, 11200919966016000, 544286360757205000, 27831091180723010400, 1492408800133053250800, 83678952234578405408000

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..12 ) ).

Mathematica

Table[n!*SeriesCoefficient[E^(Sum[((1+x)^i - 1)/i, {i, 1, 12}]), {x, 0, n}], {n, 0, 20}] (* Vincenzo Librandi, Dec 31 2012 *)

Crossrefs

Sequence in context: A259516 A342502 A334886 * A266910 A296681 A231260

Adjacent sequences: A027396 A027397 A027398 * A027400 A027401 A027402

Keyword

nonn

Author

Olivier Gérard

Status

approved