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A351781 as a simple table

na(n)
10
21
364
4104976
58153726976
646656000000000000
728079296819683655680000000
82400095991902688012207233433600000000
937800243186554601452585666030525214621696000000000

[0,1,64,104976,8153726976,46656000000000000,
 28079296819683655680000000,
 2400095991902688012207233433600000000,
 37800243186554601452585666030525214621696000000000\
 ]