Sequence : 2-dimensional faces of a polytope

[Yuval Dekel]

Apart from the SeqFan mailing list this is off topic but let me ask :

Sequence A059760 in the OEIS :
http://www.research.att.com/projects/OEIS?Anum=A059760

gives a description of the edges (one-dimensional faces) in the convex 
polytope of real n X n doubly stochastic matrices.

Can someone give a description of the 2-dimensional faces of this polytope 
and their number ?

TIA,
Yuval

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