Does this do what you want? 
my $n = $ARGV[0] || 5;
my @terms = qw( a[0][0] a[0][1] );
foreach my $i (1 .. $n-1) {
    @terms = map { ("$_ a[$i][0]","$_ a[$i][1]") } @terms;
}   
foreach my $i (0 .. $#terms) {
    print "term[$i] = $terms[$i]\n";
}

[download]
Update: fixed off-by-one error

In reply to Re: Obtaining terms in an expansion by trammell
in thread Obtaining terms in an expansion by randyk

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