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EXAMPLE
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Triangle begins
1,
2, 1,
5, 6, 1,
16, 32, 12, 1,
64, 180, 109, 20, 1,
308, 1111, 934, 276, 30, 1,
1727, 7554, 8095, 3352, 585, 42, 1,
11008, 56228, 72884, 39006, 9580, 1100, 56, 1,
78244, 454572, 688562, 451992, 144706, 23396, 1897, 72, 1
Production matrix is
2, 1,
1, 4, 1,
0, 3, 6, 1,
0, 0, 5, 8, 1,
0, 0, 0, 7, 10, 1,
0, 0, 0, 0, 9, 12, 1,
0, 0, 0, 0, 0, 11, 14, 1,
0, 0, 0, 0, 0, 0, 13, 16, 1,
0, 0, 0, 0, 0, 0, 0, 15, 18, 1
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