You can download the latest from the Seychelles Health Authorities here: https://files.seyferry.com/2020-10-14_Seychelles-Visitor-Travel-Advisory.pdf
Issued 14 Oct 2020, subject to change.

The list of allowed countries can be found here: https://files.seyferry.com/2020-09-24_List-of-Permitted-Countries-Category-1-and-Category-2-1.pdf
Also subject to change.