The explicit rule will be an = 1/3 + (n - 1)
Given the following information
a2 = a1 + 1
a2 = 4/3
For the third term
a3 = a2 + 1
a3 = 4/3 + 1
a3 = 7/3
The resulting seqence is 1/3, 4/3, 7/3
The sequence is an arithmetic sequence
a = 1/3
d = 1
The explicit rule will be an = 1/3 + (n - 1)
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