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1, 6, 36, 199, 984, 4433, 18257, 69390, 245105, 810418, 2522646, 7432876, 20825678, 55717629, 142862730, 352212459, 837368658, 1924861589, 4288250970, 9278750495, 19537503288, 40103712085, 80377128541
(list; graph; refs; listen; history; internal format)
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