Seasonally adjusted quarterly U.S. GDP from 1947(1) to 2018(3).
The format is: Time-Series [1:287] from 1947 to 2018: 2033 2028 2023 2055 2086 ...
You can find demonstrations of astsa capabilities at FUN WITH ASTSA.
The most recent version of the package can be found at https://github.com/nickpoison/astsa/.
In addition, the News and ChangeLog files are at https://github.com/nickpoison/astsa/blob/master/NEWS.md.
The webpages for the texts and some help on using R for time series analysis can be found at https://nickpoison.github.io/.
GDP