Help with advanced algebra/algebra 2

I need help !

Write a recursive rule for the sequence . The sequence may be arithmetic , geometric , or neither .

4 , 8 ,13 , 19 , 26 , ...



Thankssss !

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Thanks!

A_n = (1/2)(n^2 + 5n + 2)

It gives the following, so I think it's good:

4, 8, 13, 19, 26, 34, 43, 53, 64, 76, 89, 103, 118...