Tableau Server minimum hardware requirements is for 2 core, 8GB RAM and 15GB Disk Space.
I have never tried launching a Tableau Server from Amazon AMI, but it looks to give you the option of selecting different EC2 models. (including smaller models)
(Though I do see that the latest available version looks to be 9.2, when the latest version available from Tableau is 10.1)
Hope this helps
All the best
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Sina, it sounds like you are using our Marketplace AMIs. They are indeed locked down to "force" best practices. In other words, they will NOT allow you to run on an instance any smaller than what we recommend for production.
If you wish to use a smaller instance type, you can "self-deploy" by installing Tableau Server on the instance of your choice.