Along a street that is currently without trees, seven trees are to be planted in the pattern

Where each number designates the position of a tree. No more than two kinds of trees can be planted. If maples are used, no maple can be planted adjacent to or immediately diagonally opposite another maple. Two trees are adjacent to each other if the numbers of their positions differ by two, and immediately diagonally opposite if their numbers differ by one. The following trees, of three kinds, are available for planting:
Three red oaks
Four maples Four sycamores