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赠送一张n=1~50的表,有助于找规律。n ans 1 1 2 2 3 2 4 4 5 4 6 6 7 6 8 10 9 10 10 14 11 14 12 20 13 20 14 26 15 26 16 36 17 36 18 46 19 46 20 60 21 60 22 74 23 74 24 94 25 94 26 114 27 114 28 140 29 140 30 166 31 166 32 202 33 202 34 238 35 238 36 284 37 284 38 330 39 330 40 390 41 390 42 450 43 450 44 524 45 524 46 598 47 598 48 692 49 692 50 786 Followed by:
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