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The n^(th) term of the sequence 1, 2, 4,...

The `n^(th)` term of the sequence 1, 2, 4, 7, 11, … is

A

`n^(3) + 3n^(2) + 2n`

B

`n^(3) - 3n^(2) + 3n`

C

`(n(n+1)(n+2))/3`

D

`(n^(2)-n+2)/2`

Text Solution

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The correct Answer is:
D
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