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EXAMPLE
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Array begins:
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, ...
1, 1, 2, 2, 3, 3, 4, 4, 5, 5, ...
1, 1, 2, 4, 5, 7, 10, 12, 15, 19, ...
1, 1, 3, 5, 9, 14, 21, 30, 42, 55, ...
1, 1, 3, 7, 14, 26, 42, 66, 99, 143, ...
1, 1, 4, 10, 21, 42, 77, 132, 215, 334, ...
1, 1, 4, 12, 30, 66, 132, 246, 429, 715, ...
1, 1, 5, 15, 42, 99, 215, 429, 805, 1430, ...
1, 1, 5, 19, 55, 143, 334, 715, 1430, 2702, ...
1, 1, 6, 22, 72, 201, 501, 1144, 2431, 4862, ...
...
As triangular array, this begins:
1;
1, 1;
1, 1, 1;
1, 2, 1, 1;
1, 2, 2, 1, 1;
1, 3, 4, 3, 1, 1;
1, 3, 5, 5, 3, 1, 1;
1, 4, 7, 9, 7, 4, 1, 1;
1, 4, 10, 14, 14, 10, 4, 1, 1;
1, 5, 12, 21, 26, 21, 12, 5, 1, 1;
1, 5, 15, 30, 42, 42, 30, 15, 5, 1, 1;
...
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