#/***********************************************************
#    magicsq.rb -- 魔方陣
#***********************************************************/
# 奇数次の魔方陣 

N = 19

row = []; N.times { row.push(0) }
a = []; N.times { a.push(row.dup) }

k = 0
i = - (N / 2) ; while (i <= N / 2)
    for j in 0...N
        a[(j - i + N) % N][(j + i + N) % N] = (k += 1)
    end
    i += 1
end
for i in 0...N
    for j in 0...N; printf("%4d", a[i][j]); end
    printf("\n")
end

exit 0