Array read by antidiagonals: row n has g.f. ((1-x)/(1-2x))^n. 1, 1, 1, 1, 2, 2, 1, 3, 5, 4, 1, 4, 9, 12, 8, 1, 5, 14, 25, 28, 16, 1, 6, 20, 44, 66, 64, 32, 1
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