| 1, 1, 3, 21, 282, 6210, 202410, 9135630, 545007960, 41514583320, 3930730108200, 452785322266200, 62347376347779600, 10112899541133589200, 1908371363842760216400, 414517594539154672566000, 102681435747106627787376000, 28772944645196614863048048000
(list; graph; listen)
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