../pageable_node_list/{sortfield}/{sortdirection}/{number of results per page}/{startingRecordNumber}
Note: page number is zero indexed, so page 0 is really the first page, etc...
../pageable_node_list/title/ASC/5/0

output:
{
  "totalRecords": "6",
  "nodedata": [
    {
      "nid": "6",
      "title": "Beginner's guide to Drupal 8"
    },
    {
      "nid": "1",
      "title": "This is a new page"
    },
    {
      "nid": "2",
      "title": "This is Page A"
    },
    {
      "nid": "4",
      "title": "This is Page B"
    },
    {
      "nid": "3",
      "title": "This is Page Z"
    }
  ]
}