a(n) is the number of non-parallel lines determined by a pair of vertices (extreme points) in the polytope of real n X n doubly stochastic matrices. The vertices are the n! permutation matrices.

A059615

a(n) is the number of non-parallel lines determined by a pair of vertices (extreme points) in the polytope of real n X n doubly stochastic matrices. The vertices are the n! permutation matrices.

Terms

    a(0) =0a(1) =1a(2) =15a(3) =240a(4) =6040a(5) =217365a(6) =10651011a(7) =681667840a(8) =55215038880

External references