Sum of four squares

[franktaw at netscape.net]

http://www.research.att.com/~njas/sequences/A124978 is "Smallest number 
which has exactly n different partitions as a sum of 4 squares 
x^2+y^2+z^2+t^2."

Is it known that every number occurs as the number of partitions of 
some number into 4 squares?

(Using the b-file for A002635, I have submitted enough additional terms 
for A124978 to fill 3 lines.  426 is the smallest number that does not 
appear in that file, so this certainly seems to be true.)

Franklin T. Adams-Watters

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