This vehicle has always been available as an 8-seater (three seats in the 2nd & 3rd rows) and in 2010 became available as a 7-seater as well (two seats in the 2nd row, 3 seats in the 3rd row).
3rd row of 2015 Toyota Sequoia showing great head restraints for all 3 seats
The 7-seater model shown above was available for 2005-2007.