(0,1) matrices with distinct rows and distinct columns

[Yuval Dekel]

Hi,
The number of n X n (0,1) matrices with distinct rows is in sequence A088229 
and this is trivial .

Let me ask if there is a formula for a(n) where:
a(n) = number of n X n (0,1) matrices with distinct rows and distinct 
columns .

(or perhaps someone can compute a(n) ) .

Thanks,
Yuval

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