This module allows you to display a specified number of entities on a Views page using a different view mode than the rest of the content. It can be configured to apply this alternation on the first page of a view, and it works with content displays, not with fields.
This module allows you to alternate the first number of entities on a views page to be in a different view mode then the rest of the page.
You also have the option to do this on the first page of a view.
Only works if you display content, not on fields
First set the format to split view
Then set the view mode for the alternative styled rows.