Drag fill not continuing or recognising pattern for formulae.

So I am attempting to use drag fill to speed up my data entry input.

I am using the OFFSET function where I have the following:

=OFFSET($A$1,19,0)

=OFFSET($A$1,38,0)

=OFFSET($A$1,57,0)

In my opinion the pattern is clear so don't see how this isn't recognised. 

I've even tried switched the multiples of 19 to clearer sums such as:

=OFFSET($A$1,19*1,0)

=OFFSET($A$1,19*2,0)

=OFFSET($A$1,19*3,0)

But a pattern is clearly still not recognised.

But rather than continuing the pattern and giving me the desired

=OFFSET($A$1,76,0)

=OFFSET($A$1,95,0)

=OFFSET($A$1,114,0)

It is just cycling the previous results to give me

=OFFSET($A$1,19,0)

=OFFSET($A$1,38,0)

=OFFSET($A$1,57,0)

=OFFSET($A$1,19,0)

=OFFSET($A$1,38,0)

=OFFSET($A$1,57,0)

The cycle of depends on how many I select, so if I were to manually input 4 and then drag fill it would cycle the 4 same results.

I am unsure how to fix this issue so any help would be appreciated.

Thanks in advance.