AR(1)

Dear all,
I would like to ask you if you know any AR(1) function that can create a  sequence of values for different time lags.

The AR(1) based on a starting value and with the gaussian error can produce this time lags.

Could you please help me find a function that can do and does not depend on any sequence?

I would like to thank you in advance for your help

Best Regards
Alex