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1, 1, 1, 2, 4, 6, 10, 19, 38, 66, 126, 236, 472, 868, 1716, 3235, 6470, 12190, 24310, 46252, 92504, 176484, 352716, 676270, 1352540, 2600612, 5200300, 10030008, 20060016, 38781096, 77558760, 150273315
(list; graph; refs; listen; history; internal format)
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