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2, 4, 14, 56, 282, 1696, 11876, 95010, 855097, 8550971, 94060683, 1128728204, 14673466654, 205428533159, 3081427997387, 49302847958201, 838148415289426, 15086671475209678, 286646758028983900, 5732935160579678000
(list; graph; refs; listen; history; internal format)
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