Cell Mitosis Problem

Please explain why we are not considering a dp[i+1] case if i is even through an example.

Cell mitosis issue Refer this discussion.

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cell mitosis.
I have done this through memoisation and it passed 3 taste cases.
i also figured the error but I m not able to resolve it.
plz help
code. https://ide.codingblocks.com/s/262439.