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EXAMPLE
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The square array begins:
1, 1, 1, 1, 1, 1, ...
1, 2, 5, 14, 42, 132, ...
1, 5, 33, 234, 1706, 12618, ...
1, 14, 238, 4146, 72152, 126804, ...
1, 42, 1782, 75187, 3099106, ...
1, 132, 13593, 1378668, ...
1, 429, 104756, 25430445, ...
...
As a triangular array:
1,
1, 1,
1, 2, 1,
1, 5, 5, 1,
1, 14, 33, 14, 1,
1, 42, 234, 238, 42, 1,
1, 132, 1706, 4146, 1782, 132, 1,
...
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