Math: Recursive Sequence ?

Given the following recursive sequence, fine a4. 
a1= 8
an= 4a(subscript n-1) -5

Robert2021-03-19T15:45:49Z

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a_1 = 8

a_2 = 4a_1 - 5 = 32 - 5 = 27

a_3 = 4a_2 - 5 = 108 - 5 = 103

a_4 = 4a_3 - 5 = 412 - 5 = 407

?2021-03-20T23:15:49Z

Given the following recursive sequence, find a4.
a1 = 8
an = 4a(subscript n-1) - 5
a4 = 407