In this work, we propose to search for the exotic doubly charmed meson T + cc and its analog T + ccs in B + c decays, which provide a good environment for the formation of the exotic state containing double charm quarks. Within the molecular scheme, the production of T + cc and T + ccs through various rescattering processes with different intermediate states are investigated. For the moderate values of model parameters, the branching ratios of B + c decaying into T + cc D0 , T + cc D * 0 , T + ccs D0 and T + ccs D * 0 are estimated to be of the order of 10 −7 , 10 −5 , 10 −6 and 10 −4 , respectively, which may be tested by future experiments.