You Do Need power plug adapter while traveling from Mali to Seychelles.

Here is Why You Need An Adapter

The outlet and plug type used in Seychelles is G and in Mali are C and E. This is how they look like.

Mali

In Mali, outlets of type C and E are in use.

Type C

Type E

Seychelles

In Seychelles, outlets of type G are in use.

Type G