Square Pattern: Number of Squares in Each Diagram

Each diagram in the sequence consists of a number of squares.

1. Draw diagram \({5}\) of the sequence in the answer space.
2. The table shows the diagram number and the respective number of squares. Write down the value of \({a}\) and \({b}\).

   Diagram number	\({1}\)	\({2}\)	\({3}\)	\({4}\)	\({5}\)	\({6}\)
   Number of squares	\({6}\)	\({10}\)	\({14}\)	\({18}\)	\({a}\)	\({b}\)

3. Write down, in terms of \({n}\), the formula of this sequence.
4. There are \({106}\) squares in diagram \({N}\). Find the value of \({N}\).