Hi, sorry can't seem to figure this out..please help me ..?

1+3=4

1+3+9=13

1+3+9 +27 = 40

and so on..

find an expression for this sequence

any guidance would help soo much .. so lost!!

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- March 17th 2010, 01:34 AMDgphrusequences
Hi, sorry can't seem to figure this out..please help me ..?

1+3=4

1+3+9=13

1+3+9 +27 = 40

and so on..

find an expression for this sequence

any guidance would help soo much .. so lost!! - March 17th 2010, 01:50 AMHallsofIvy