Return an array of numbers which (effectively) count from 0 to N^M-1 in base N. The result should be returned in a matrix, with each column representing a number. Each element represents a digit of the number. Lower-indexed rows represent lower-significance digits.

Example 1 (Binary): countInBaseN(2,2) (counts from 0 to 3 in base 2)

ans =

     0     0     1     1
     0     1     0     1

Example 2 (Ternary): countInBaseN(2,3) (counts from 0 to 8 in base 3)

ans =

     0     0     0     1     1     1     2     2     2
     0     1     2     0     1     2     0     1     2