Return multiple copies of same row in table with sequence number

I want to return multiple copies of data from a table but do not
understand how to accomplish this.  The following code works to return
a fixed number of copies but I cannot determine how to replace the
constant with a variable.  How do I do this and is there an easier
way?

I need to print numbered certificates for an employee.  I can use the
following sql to generate a fixed number of certificates but the
number I need is in a field on the record.

select x.SeqNo,e.EmployeeNo,e.EmployeeName
  from Employees e,
 (select rownum SeqNo from dual connect by level <= 3) x
  where e.EmployeeNo = 78
order by SeqNo

This returns:

1 78 Joe
2 78 Joe
3 78 Joe

What I need is:

select x.SeqNo,e.EmployeeNo,e.EmployeeName
  from Employees e,
 (select rownum SeqNo from dual connect by level <=
e.CertificateCount) x
  where e.EmployeeNo = 78
order by SeqNo

However the above SQL returns ORA-00904: "H"."LICENSECOUNT": invalid
identifier.

I have tried a number of other approaches but none have worked.

Thanks.