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EXAMPLE
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Square array begins:
n=0: 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, ...
n=1: 1, 2, 3, 4, 5, 6, 6, 0, 0, 0, 0, 0, ...
n=2: 1, 3, 6, 10, 15, 21, 27, 27, 0, 0, 0, 0, ...
n=3: 1, 4, 10, 20, 35, 56, 83, 110, 110, 0, 0, 0, ...
n=4: 0, 4, 14, 34, 69, 125, 208, 318, 428, 428, 0, 0, ...
n=5: 0, 0, 14, 48, 117, 242, 450, 768, 1196, 1624, 1624, 0, ...
...
Square array, read by rows, with 0 omitted:
...1, 1, 1, 1, 1, 1
...1, 2, 3, 4, 5, 6, 6
...1, 3, 6, 10, 15, 21, 27, 27
...1, 4, 10, 20, 35, 56, 83, 110, 110
...4, 14, 34, 69, 125, 208, 318, 428, 428
..14, 48, 117, 242, 450, 768, 1196, 1624, 1624
..48, 165, 407, 857, 1625, 2821, 4445, 6069, 6069
.165, 572, 1429, 3054, 5875, 10320, 16389, 22458, 22458
.572, 2001, 5055, 10930, 21250, 37639, 60097, 82555, 82555
2001, 7056, 17986, 39236, 76875, 136972, 219527, 302082, 302082
...
Triangle begins:
1
1, 1
1, 2, 1
1, 3, 3, 1
1, 4, 6, 4, 0
1, 5, 10, 10, 4, 0
0, 6, 15, 20, 14, 0, 0
0, 6, 21, 35, 34, 14, 0, 0
...
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