google sheets - How to extract every n-th row using array formula

Question

I try to extract every nth row of my datatable. I know how to do it using INDIRECT and ROW formulas, I could try search the content and extract data this way (arrayformula + if(regexmatch())

But I wonder if there's a way to make it in one line. With no respect for it's content.

I tried INDEX, OFFSET, INDIRECT but these functions does not work with ARRAYFORMULA in the way I expected.

You can play with my data here: https://docs.google.com/spreadsheets/d/1KUqXTvRlONbi5f3w3bVwVPBKfxWiSfiXsO5vHPWDiog/edit?usp=sharing

question from:https://stackoverflow.com/questions/65641374/how-to-extract-every-n-th-row-using-array-formula

Answer 1

use:

=FILTER(A5:A; MOD(ROW(A5:A)+1; 3)=0)