Function diagonal_sum

project_euler/problem_28/sol1.py:9–17

(n)

	xrange = range	#Python 3

def diagonal_sum(n):
	total = 1

	for i in xrange(1, int(ceil(n/2.0))):
		odd = 2*i+1
		even = 2*i
		total = total + 4*odd**2 - 6*even

	return total

if __name__ == '__main__':
	import sys