Almost got it, but not quite!
Hi William, you are right. The sign should only be negative when n = 2. Thanks.
Finding Perfect Squares
Acid and water
Convert String to Morse Code
USC Fall 2012 ACM: Driving the Rover
Easy Sequences 32: Almost Pythagorean Triples
Easy Sequences 26: Prime-Integer Line Segments
Easy Sequences 24: Number of Coprime Lattice Points
Easy Sequences 30: Nearly Pythagorean Triangles
Easy Sequences 19: Length of Prime-sided Rectangle with Maximum Area
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