Question 1026054
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Given the sequence 1,4,16,64 write an explicit formula for the nth term of the sequence in f(n) notation 
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Geometric progression with the first term {{{a}}} = {{{a[1]}}} = 1 and the common ratio r = 4.

The formula for the general term is {{{a[n]}}} = {{{a[1]*r^(n-1)}}} = {{{4^(n-1)}}}, n = 1, 2, 3, 4, . . . 

See the lesson <A HREF=https://www.algebra.com/algebra/homework/Sequences-and-series/Geometric-progressions.lesson>Geometric progressions</A> in this site.
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