Let A = [a_ij] be a matrix of order 3 × 3, with \(\mathrm{a}_{\mathrm{ij}}=(\sqrt{2})^{\mathrm{i}+\mathrm{j}}\). If the sum of all the elements in the third row of A² is \(\alpha+\beta \sqrt{2}, \) α, β ∈ Z, then α + β is