Associative magic square

In the Lo Shu Square, pairs of opposite numbers sum to 10
Detail from Melencolia I showing a 4 × 4 associative square

An associative magic square is a magic square for which each pair of numbers symmetrically opposite to the center sum up to the same value. For an n × n square, filled with the numbers from 1 to n2, this common sum must equal n2 + 1. These squares are also called associated magic squares, regular magic squares, regmagic squares, or symmetric magic squares.

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