| 0, 2, 27, 224, 1500, 8910, 49049, 256256, 1288872, 6298500, 30093910, 141210432, 652860520, 2981331990, 13472983125, 60343756800, 268187306640, 1183875281820, 5194996380090, 22676052360000, 98513956031400, 426171522716940, 1836562780483002
(list; graph; listen)
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