Notice that the pattern number can be used as the position number, n, and that the numbers of matches from a sequence, just like those considered in the previous section.

The number added on each time is two but you could also see that this was true form the original diagrams. This means that the number of matches for pattern n is the same as the value pf the nth term of the sequence.

Use the ideas from the previous section to find the value of the `something`

Talking any term in the sequence from the table, for example the first: n = 1, so 2n = 2 x 1 = 2

But the first term is 3, so you need to add 1. So, nth term=2n+1

Which means that, if you let `p` be the number of matches in pattern n then, p=2n+1