Question: Matrix-generation

Hiya! I'm at a loss for how to properly generate a set of n x n-matrices of the form [-1]; [[0,-1], [-1,0]]; [[0,0,-1], [0, -1, 0], [-1, 0, 0]] ... and so on, for n from 1 to an arbitrary value. I've had a good look at the constructer options for Matrix() but failed to spot the proper solution. I'd like to do so in a loop or seq, so I can perform the needed operations on them, without having to keep a lot of arbitrary variables. Any good hints or tips?
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