* The sumOfSquares() function should be called for n = 0 up to     and including 15.    * The pell() function should be called for n = 0 up to and     including 15.    * The powers() function should be called for m = 2 up to and     including 10 and n = 1 up to and including 10.  The m loop     should be outermost and the n loop innermost.    * The arguments and results of each call should be printed in     messages matching those shown in outputdata.txt.