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Write an explicit equation for the sequence based on the graph below.

A first quadrant coordinate plane, with, x axis, labeled as, n, scaled by integers from 0 to 5, and, y axis, labeled as, t of n, scaled by multiples of 4 from 0 to 20. The discrete graph, has the following 3 points: (1, comma 4), (2, comma 10), and (3, comma 16).