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EXAMPLE
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Given (1, -1, -1, 0, -1...) taking finite differences, we obtain the array:
1, -1, -1, 0, -1, 1, -1...
__ -2, 0 1, -1, 2, -2...
_____ 2, 1, -2, 3, -4...
_________-1, -3, 5, -7...
____________-2, 8, -12...
______________ 10, -20...
__________________-30...
Left border = A124839
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