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1, 3, 10, 36, 136, 530, 2109, 8515, 34739, 142817, 590537, 2452639, 10221505, 42714623, 178888442, 750500716, 3153137436, 13263180550, 55844218906, 235323138044, 992316962382, 4186870456952, 17674378119680, 74641954142026
(list; graph; refs; listen; history; internal format)
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