Hi Randall Risser,
If you want to add sequence number for every task, You have to add a field in task model and need to define a record in ir.sequence as xml.
For example:

in your project.task model please add one field and a function,

name = fields.Char(string="Task No", readonly=True, required=True, copy=False, default='New')

@api.model   

def create(self, vals):
        if vals.get('name', 'New') == 'New':
                vals['name'] = self.env['ir.sequence'].next_by_code('project.task') or 'New'       

        result = super(FlightReport, self).create(vals)       

        return result

In your XML:

Hope this may help you.