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- def main(by):
- diagonal = (by+1)*0.5
- print(spiral(diagonal))
- def spiral(d):
- if d == 1:
- return 1
- else:
- downright = 4*d**2-10*d+7
- downleft = 4*d**2-8*d+5
- upleft = 4*d**2-6*d+3
- upright = 4*d**2-4*d+1
- diagonalsum = downright + downleft + upleft + upright
- return diagonalsum + spiral(d-1)
- # Test
- main(1001)
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