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1, 4, 12, 80, 304, 2176, 8832, 64768, 271104, 2013184, 8579072, 64200704, 276815872, 2082406400, 9053405184, 68364861440, 299056168960, 2264753766400, 9954207989760, 75553161871360, 333336432082944, 2534637351993344
(list; graph; refs; listen; history; internal format)
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