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1, 2, 3, 7, 16, 39, 98, 252, 659, 1747, 4682, 12662, 34505, 94644, 261069, 723707, 2014952, 5631875, 15796210, 44444302, 125405217, 354765866, 1006003375, 2858939669, 8141135778, 23225997936, 66376634429, 190000938785
(list; graph; refs; listen; history; internal format)
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