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EXAMPLE
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The array begins:
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, ...
2, 6, 12, 20, 30, 42, 56, 72, 90, 110, 132, 156, ...
3, 12, 31, 64, 115, 188, 287, 416, 579, 780, 1023, 1312, ...
4, 20, 64, 160, 340, 644, 1120, 1824, 2820, 4180, 5984, 8320, ...
5, 30, 115, 340, 841, 1826, 3591, 6536, 11181, 18182, 28347, 42652, ...
6, 42, 188, 644, 1826, 4494, 9912, 20040, 37758, 67122, 113652, 184652, ...
7, 56, 287, 1120, 3591, 9912, 24319, 54272, 112071, 216952, 397727, 696032, ...
8, 72, 416, 1824, 6536, 20040, 54272, 132864, 299208, 628232, 1242912, 2336672, ...
...
The first few antidiagonals are:
1,
2, 2,
3, 6, 3,
4, 12, 12, 4,
5, 20, 31, 20, 5,
6, 30, 64, 64, 30, 6,
7, 42, 115, 160, 115, 42, 7,
8, 56, 188, 340, 340, 188, 56, 8,
9, 72, 287, 644, 841, 644, 287, 72, 9,
10, 90, 416, 1120, 1826, 1826, 1120, 416, 90, 10,
...
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