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EXAMPLE
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Triangle begins:
1,
1, 1,
1, 2, 1,
1, 3, 3, 1,
1, 4, 6, 4, 1,
1, 5, 9, 9, 5, 1,
1, 6, 14, 18, 14, 6, 1,
1, 7, 18, 25, 25, 18, 7, 1,
1, 8, 23, ?, ?, ?, 23, 8, 1,
1, 9, 28, ?, ?, ?, ?, 28, 9, 1,
1, 10, 36, ?, ?, ?, ?, ?, 36, 10, 1,
...
Also:
. 1,
. 1, 1,
. 1, 2, 1,
. 1, 3, 3, 1,
. 1, 4, 6, 4, 1,
. 1, 5, 9, 9, 5, 1,
. 1, 6, 14, 18, 14, 6, 1,
. 1, 7, 18, 25, 25, 18, 7, 1,
. 1, 8, 23, ?, ?, ?, 23, 8, 1,
. 1, 9, 28, ?, ?, ?, ?, 28, 9, 1,
. 1, 10, 36, ?, ?, ?, ?, ?, 36, 10, 1,
...
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