How to pass variable value inside the name of a parameter in Oracle SQL?

Question

So I want to drop a sequence in Oracle SQL and the sequence name holds a variable that I need to pass to the SQL script. So I was writing like the following. For testing in SQLplus, I declared the variable like this and after that I tried to use the variable value in the SQL:

But as you see the enclosing single quotes are creating the problem. I tried to not give the quotes, but then it asks for the values. I tried to escape them, but still they remained. So in this case, how can I pass the parameter to the SQL?