A027402 Number of labeled servers of dimension 15.

1, 15, 330, 9010, 288240, 10473072, 423446080, 18775484160, 903038514720, 46713885798880, 2581318186453824, 151514025671607360, 9402355792409835520, 614406453498776970240, 42132162349935136988160

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..15 ) ).

Mathematica

Table[n!*SeriesCoefficient[E^(Sum[((1+x)^i - 1)/i, {i, 1, 15}]), {x, 0, n}], {n, 0, 20}] (* Vincenzo Librandi, Jan 01 2013 *)

Crossrefs

Sequence in context: A180779 A196666 A025751 * A053104 A114937 A289180

Adjacent sequences: A027399 A027400 A027401 * A027403 A027404 A027405

Keyword

nonn

Author

Olivier Gérard

Status

approved