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EXAMPLE
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The initial antidiagonals are:
1,
1, 1,
1, 7, 1,
1, 17, 17, 1,
1, 31, 90, 31, 1,
1, 49, 284, 284, 49, 1,
1, 71, 687, 1398, 687, 71, 1,
1, 97, 1411, 4861, 4861, 1411, 97, 1,
1, 127, 2592, 13555, 23020, 13555, 2592, 127, 1,
1, 161, 4390, 32436, 83858, 83858, 32436, 4390, 161, 1,
...
The array begins:
1, 1, 1, 1, 1, 1, 1, 1, 1, ...
1, 7, 17, 31, 49, 71, 97, 127, 161, ...
1, 17, 90, 284, 687, 1411, 2592, 4390, 6989, ...
1, 31, 284, 1398, 4861, 13555, 32436, 69350, 135985, ...
1, 49, 687, 4861, 23020, 83858, 253876, 669660, 1587491, ...
1, 71, 1411, 13555, 83858, 386774, 1445748, 4613486, 13010537, ...
1, 97, 2592, 32436, 253876, 1445748, 6539320, 24831150, 82162821, ...
1, 127, 4390, 69350, 669660, 4613486, 24831150, 110639796, 424473531, ...
1, 161, 6989, 135985, 1587491, 13010537, 82162821, 424473531, 1868934548, ...
...
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