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How many hadamard matrix matrices exists for size n?

  1. Nov 26, 2015 #1
    1. The problem statement, all variables and given/known data
    How many hadamard matrices exists for size n?

    2. Relevant equations
    Hadamard matrices are square matrices whose entries are either +1 or −1 and whose rows are mutually orthogonal.

    3. The attempt at a solution
    I am just curious how many exists for 4, 8 and in general.
  2. jcsd
  3. Nov 26, 2015 #2
    0 if n is odd :-)
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