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1, 1, 2, 3, 6, 11, 22, 43, 94, 173, 398, 707, 1680, 2917, 7085, 12111, 29877, 50503, 126021, 211263, 531751, 885831, 2244627, 3720995, 9478605, 15652239, 40040183, 65913927, 169193597, 277822147, 715143046, 1171853635, 3023492646
(list; graph; refs; listen; history; internal format)
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