That is, the number of branches in the third graph = ~ 1+3 ~× 2 = 8.
The number of branches in the fourth graph = ~ 1+8 ~× 2 = 18.
The number of branches in the fifth graph = ~ 1+ 18 ~× 2 = 38.
The number of branches in the sixth graph = ~ 1+38 ~× 2 = 78.
The number of branches in the seventh graph = ~ 1+78 ~× 2 = 158.
So the seventh picture has more branches than the sixth picture 158-78 = 80.