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1, 2, 5, 20, 121, 982, 9933, 120168, 1692273, 27196522, 491229653, 9851789564, 217230600041, 5223386190526, 136025271553693, 3813930989693904, 114553954962370785, 3669540489785558994, 124878930607671376549, 4499311042365955114724, 171098698540513965736025
(list; graph; refs; listen; history; internal format)
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