Copy / drag formula to next nth row

Hi guys,

Please help, is there a formula wherein, if dragging it down 5 rows lower the cell reference should still be in series. example e3=+sheet1!$A1, dragging it down to e8 the formula should be e8=+sheet1!$A2, but as i do it the formula i get is e8=+sheet!$A6.

please see attached file for clearer example.

Thank you so much =)