SOLUTION: For the sequence 1,6,20,56,..., what is a<sub>n</sub>?

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Question 1085216: For the sequence 1,6,20,56,..., what is an?
Answer by AnlytcPhil(1806) About Me  (Show Source):
You can put this solution on YOUR website!

1,6,20,56,....

That's

1×1, 2×3, 4×5, 8×7, 16*9, ...

an = 2n-1(2n-1)

Edwin