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EXAMPLE
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First few rows of the triangle =
1;
3, 1;
6, 3, 2;
10, 6, 5, 3;
15, 10, 9, 7, 4;
21, 15, 14, 12, 9, 5;
28, 21, 10, 18, 15, 11, 6;
36, 28, 27, 25, 22, 18, 13, 7;
45, 36, 35, 33, 30, 26, 21, 15, 8;
55, 45, 44, 42, 39, 35, 30, 24, 17, 9;
66, 55, 54, 52, 49, 45, 40, 34, 27, 19, 10;
78, 66, 65, 63, 60, 56, 51, 45, 38, 30, 21, 11;
91, 78, 77, 75, 72, 68, 63, 57, 50, 42, 33, 23, 12;
...
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