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EXAMPLE
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Array begins:
1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, ...
1, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, ...
1, 4, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, ...
1, 4, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, ...
1, 4, 8, 10, 10, 10, 10, 10, 10, 10, 10, 10, ...
1, 4, 8, 11, 12, 12, 12, 12, 12, 12, 12, 12, ...
1, 4, 8, 12, 14, 14, 14, 14, 14, 14, 14, 14, ...
1, 4, 8, 12, 15, 16, 16, 16, 16, 16, 16, 16, ...
1, 4, 8, 12, 16, 18, 18, 18, 18, 18, 18, 18, ...
1, 4, 8, 12, 16, 19, 20, 20, 20, 20, 20, 20, ...
...
The initial antidiagonals are:
1;
1, 2;
1, 3, 2;
1, 4, 4, 2;
1, 4, 6, 4, 2;
1, 4, 7, 6, 4, 2;
1, 4, 8, 8, 6, 4, 2;
1, 4, 8, 10, 8, 6, 4, 2;
1, 4, 8, 11, 10, 8, 6, 4, 2;
1, 4, 8, 12, 12, 10, 8, 6, 4, 2;
1, 4, 8, 12, 14, 12, 10, 8, 6, 4, 2;
...
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