One term in the number series is wrong. Find out the wrong term. 1, 3, 10, 21, 6

Question

One term in the number series is wrong. Find out the wrong term.
1, 3, 10, 21, 64, 129, 356, 777

Options:

A . 21

B . 129

C . 10

D . 356

Answer: Option D

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