Excel sequential dates with gaps

Question

I am trying to create a backup for my timesheet in Excel because I work in several different departments. I need to do a run of seven dates, a space, run of another seven dates, followed by three spaces on repeat. These are all done in column and the empty spaces are empty rows. I want to be able to format this for the entire year. Below is an example. Thank you for any assistance.

1/1/2021
1/2/2021
1/3/2021
1/4/2021
1/5/2021
1/6/2021
1/7/2021
(empty row)
1/8/2021
1/9/2021
1/10/2021
1/11/2021
1/12/2021
1/13/2021
1/14/2021
(empty row)
(empty row)
(empty row)

1/15/2021

and so on...

Answer 1

Put 1/1/2021 in A1

In A2 put:

=IF(OR(MOD(ROW($ZZ1),18)+1={8,16,17,18}),"",MAX($A$1:A1)+1)

And copy down.