For the sequence 1, 7, 25, 79, 241, 727 simple formula for {an} is _

1.	For the sequence 1, 7, 25, 79, 241, 727 simple formula for {a_n} is ____________
A.	3<sup>n+1</sup> 2
B.	3<sup>n</sup> 2
C.	(-3)<sup>n</sup> + 4
D.	n<sup>2</sup> 2
Answer» C. (-3)<sup>n</sup> + 4

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