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1, 2, 6, 11, 26, 61, 132, 290, 638, 1390, 3012, 6496, 13940, 29793, 63450, 134628, 284764, 600596, 1263304, 2650684, 5549117, 11592553, 24170837, 50306424, 104527509, 216852455, 449232326, 929378744, 1920295902, 3963077103
(list; graph; refs; listen; history; internal format)
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