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EXAMPLE
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Triangle begins, n >= 1, 0 <= k < n:
1;
1, 1;
1, 0, 1;
1, 1, 1, 1;
1, 0, 1, 0, 1;
1, 1, 2, 2, 1, 1;
1, 0, 1, 0, 1, 0, 1;
1, 1, 2, 3, 3, 2, 1, 1;
1, 0, 2, 0, 3, 0, 2, 0, 1;
1, 1, 2, 3, 4, 4, 3, 2, 1, 1;
1, 0, 1, 0, 2, 0, 2, 0, 1, 0, 1;
1, 1, 4, 7, 11, 13, 13, 11, 7, 4, 1, 1;
1, 0, 1, 0, 3, 0, 4, 0, 3, 0, 1, 0, 1;
1, 1, 2, 3, 6, 6, 9, 9, 6, 6, 3, 2, 1, 1;
1, 0, 3, 0, 8, 0, 12, 0, 12, 0, 8, 0, 3, 0, 1;
1, 1, 3, 7, 16, 27, 40, 48, 48, 40, 27, 16, 7, 3, 1, 1;
1, 0, 1, 0, 4, 0, 7, 0, 10, 0, 7, 0, 4, 0, 1, 0, 1;
1, 1, 4, 7, 16, 24, 38, 45, 54, 54, 45, 38, 24, 16, 7, 4, 1, 1;
...
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