How to view every n-th row in a DataFrame

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How to view every n-th row in a DataFrame?
My DataFrame is a plane table of 1334400 x 22 entries. I would like to view every 21-th entire row.
Could anyone help?

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df[1:21:nrow(df), :]

you might consider @views df[1:21:nrow(df), :] to make this quicker and more memory efficient (depening on what you are doing afterwards)

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Thanks. What speeks for nrow(df) instead of just end to set the boundaries?

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Nothing actually - just didn’t think of that!