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1, 1, 3, 6, 16, 41, 108, 299, 828, 2299, 6401, 17875, 50062, 140601, 399267, 1144669, 3283839, 9427981, 27090715, 77911897, 224272499, 646157234, 1863317958, 5377939756, 15535195892, 45060652609, 131334677147, 382907083385
(list; graph; refs; listen; history; internal format)
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