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Omni-MATH / Find all positive integers n such that the unit segments of an n×n grid of unit squares can be partitioned into groups of three such that the segments of each group share a common …

Problem

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problem

Find all positive integers nn such that the unit segments of an n×nn \times n grid of unit squares can be partitioned into groups of three such that the segments of each group share a common vertex.
Plain-text mathematical notation (without MathML)
Find all positive integers n such that the unit segments of an n×n grid of unit squares can be partitioned into groups of three such that the segments of each group share a common vertex.
Original LaTeX notation
Find all positive integers $n$ such that the unit segments of an $n \times n$ grid of unit squares can be partitioned into groups of three such that the segments of each group share a common vertex.

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