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1, 2, 49, 100, 2449, 4998, 122401, 249800, 6117601, 12485002, 305757649, 624000300, 15281764849, 31187529998, 763782484801, 1558752499600, 38173842475201, 77906437450002, 1907928341275249, 3893763120000500
(list; graph; refs; listen; history; internal format)
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