Question

Find an expression for the number of squares in the nth pattern of the sequence. I noticed that the number of squares you add in each pattern it depends on the pattern number (see image) but I don't know how to get the expression. ​

Answer 1

The answer is T(n)=5(n-1)+n+1

because = T(4)=5(4-1)+4+1

=T4=5(3)+5

=T4=15+5

=T4=20

this took me half an hour