Find a closed form formula for the sequence depicted in the diagram below. For this problem,andenotes the growing number of squares in each figure, soa1= 1, a2= 5, a3= 13, etc.

Problem 1 [20 points] Quilting Mathematics Find a closed form formula for the sequence depicted in the diagram below. For this problem, an denotes the growing number of squares in each figure, so a1 = 1, a2 = 5, a3 = 13, etc.)