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0, 2, 4, 8, 18, 42, 102, 256, 658, 1722, 4570, 12264, 33212, 90626, 248892, 687360, 1907506, 5316266, 14873082, 41751944, 117567784, 331979650, 939807344, 2666718976, 7583071868, 21605822594, 61672362872, 176338826728
(list; graph; refs; listen; history; internal format)
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