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The unique electronic property induced diversified structure of boron(B)cluster has attracted much interest from experimentalists and theorists.B30-40 were reported to be planar fragments of triangular lattice with proper concentrations of vacancies recently.Here,we have performed high-throughput screening for possible B clusters through the first-principles calculations,including various shapes and distributions of vacancies.As a result,we have determined the structures of Bn clusters with n = 30-51 and found a stable planar cluster of B49 with a double-hexagon vacancy.