For 1 X 1 filet every square will equal 2 ch plus the pattern starts with a block so add 3 ch (if pattern started with a space add 4 ch)
13 squares X 2 ch = 26 + 3 end ch = 29 sts
For 1 X 2 filet every square will equal 3 ch plus the pattern starts with a block so add 3 ch (if pattern started with a space add 5 ch)
13 squares X 3 ch = 39 + 3 end ch = 42 sts
For 1 X 3 filet every square will equal 4 ch plus the pattern starts with a block so add 3 ch (if pattern started with a space add 6 ch)
13 squares X 4 ch = 52 + 3 end ch = 55 sts
For 1 X 4 filet every square will equal 5 ch plus the pattern starts with a block so add 3 ch (if pattern started with a space add 7 ch)
13 squares X 5 ch = 65 + 3 end ch = 68 sts