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We present an approach to compute $n_g$ by using even gaps, and the question: Is it true that $n_{g+1}>n_g$? is investigated. Let $N_\\gamma(g)$ be the number of numerical semigroups of genus $g$ whose number of even gaps equals $\\gamma$. We show that $N_\\gamma(g)=N_\\gamma(3\\gamma)$ for $\\gamma \\leq \\lfloor g/3\\rfloor$ and $N_\\gamma(g)=0$ for $\\gamma > \\lfloor 2g/3\\rfloor$; thus the question above is true provided that $N_\\gamma(g+1) > N_\\gamma(g)$ for $\\gamma = \\lfloor g/3 \\rfloor +1, \\ldots, \\lfloor 2g/3\\rfloor$. 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