Involutions and pseudo-involutions in the Riordan group are interesting because of their numerous applications. In this paper we study involutions using sequence characterizations of the Riordan arrays. For a given B-sequence we find the unique function f(z) such that the array (g(z), f (z)) is a pseudo-involution. As a combinatorial application, we find the interpretation of each entry in the Bell array (g(z),f(z)) with a given B-sequence.