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EXAMPLE
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The array begins:
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, ...
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, ...
0, 2, 5, 8, 11, 14, 17, 20, 23, 26, ...
0, 3, 8, 14, 20, 26, 32, 38, 44, 50, ...
0, 4, 11, 20, 30, 40, 50, 60, 70, 80, ...
0, 5, 14, 26, 40, 55, 70, 85, 100, 115, ...
0, 6, 17, 32, 50, 70, 91, 112, 133, 154, ...
0, 7, 20, 38, 60, 85, 112, 140, 168, 196, ...
0, 8, 23, 44, 70, 100, 133, 168, 204, 240, ...
0, 9, 26, 50, 80, 115, 154, 196, 240, 285, ...
...
As a triangle:
0,
0, 0,
0, 1, 0,
0, 2, 2, 0,
0, 3, 5, 3, 0,
0, 4, 8, 8, 4, 0,
0, 5, 11, 14, 11, 5, 0,
0, 6, 14, 20, 20, 14, 6, 0,
0, 7, 17, 26, 30, 26, 17, 7, 0,
0, 8, 20, 32, 40, 40, 32, 20, 8, 0,
...
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