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EXAMPLE
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Triangle begins:
2;
3, 1;
5, 2, 1;
7, 2, 0, -1;
11, 4, 2, 2, 3;
13, 2, -2, -4, -6, -9;
Alternative: array form read by antidiagonals:
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31,...
1, 2, 2, 4, 2, 4, 2, 4, 6, 2, 6,...
1, 0, 2, -2, 2, -2, 2, 2, -4, 4, -2,...
-1, 2, -4, 4, -4, 4, 0, -6, 8, -6, 0,...
3, -6, 8, -8, 8, -4, -6, 14, -14, 6, 4,...
-9, 14, -16, 16, -12, -2, 20, -28, 20, -2, -8,...
23, -30, 32, -28, 10, 22, -48, 48, -22, -6, 10,..,
-53, 62, -60, 38, 12, -70, 96, -70, 16, 16, -12,...
115,-122, 98, -26, -82, 166,-166, 86, 0, -28, 28,...
-237, 220,-124, -56, 248,-332, 252, -86, -28, 56, -98,...
457,-344, 68, 304,-580, 584,-338, 58, 84,-154, 308,...
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