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1, 6, 40, 184, 688, 2178, 6116, 15493, 36203, 78954, 162537, 318261, 596881, 1077561, 1881218, 3187222, 5257026, 8463247, 13329249, 20576809, 31189362, 46486870, 68222601, 98696480, 140898502, 198674609, 276933307, 381882149
(list; graph; refs; listen; history; internal format)
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