David W. answered • 05/23/19

Experienced Prof

a_{0}=-13

a_{1}=13

a_{k-2} +a_{k-1} [for k>1]

a_{0} = **-13**

a_{1} = 13

a_{2} = a_{0} + a_{1} = -13 + 13 = **0 ** [note: k=2]

a_{3} = a_{1 }+ a_{2 }= 13 + 0 = **13 ** [k=3]

a_{4} = a_{3} + a_{2} = 0 + 13 =** 13** [k=4]

Note that some sequences begin with a_{0} and some with a_{1}. These are "the first five terms."