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EXAMPLE
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First few rows of the triangle:
1;
2, 0;
3, 1, 0;
4, 0, 0, 0;
5, 2, 1, 0, 0;
6, 0, 0, 0, 0, 0;
7, 3, 0, 1, 0, 0, 0;
8, 0, 2, 0, 0, 0, 0, 0;
9, 4, 0, 0, 1, 0, 0, 0, 0;
10, 0, 0, 0, 0, 0, 0, 0, 0, 0;
11, 5, 3, 2, 0, 1, 0, 0, 0, 0, 0;
12, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0;
13, 6, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0;
14, 0, 4, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0;
15, 7, 0, 3, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0;
16, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0;
17, 8, 5, 0, 0, 2, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0;
18, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0;
19, 9, 0, 4, 3, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0;
...
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