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0, 0, 4, 12, 34, 110, 354, 1120, 3552, 11290, 35862, 113884, 361702, 1148810, 3648670, 11588338, 36805222, 116895404, 371266018, 1179160836, 3745078428, 11894570660, 37777796510, 119984315496, 381076645196, 1210319938646, 3844041278068, 12208882029838
(list; graph; refs; listen; history; internal format)
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