Isomers are of different types. To find the number of particular isomers is possible. For example, The formula for finding the maximum number of stereoisomers X is X = 2n, where n is the number of stereogenic atoms in the molecule. Alkanes can be very simple examples of this. With the structural formula C4H10, there are two different isomers possible. As the number of Carbons in an alkane increase, the number of structural isomers also increases.