Write an Expression for the N Th Term of the Sequence

Multiple Choice

Write an expression for the n th term of the sequence $2,5,10,17,26,....$ Assume that n begins with 1.

A) $a _ { n } = n + 4$
B) $a _ { n } = n ^ { 2 } + 1$
C) $a _ { n } = n ^ { 3 } + 1$
D) $a _ { n } = n ^ { 3 } - 2$
E) $a _ { n } = n ^ { 2 } - 2$