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2, 16, 50, 176, 738, 3408, 16402, 80368, 397250, 1972880, 9824754, 49005360, 244672162, 1222297552, 6108298706, 30531927152, 152630937474, 763068593424, 3815084686258, 19074648589744, 95370918425186, 476847618556496
(list; graph; refs; listen; history; internal format)
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