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A056586 as a simple table

na(n)
00
11
21
3512
419683
51953125
6134217728
710604499373
8794280046581
960716992766464
104605366583984375
11350356403707485209
1226623333280885243904
132023966356928852115753
14153841020405122283630137

[0,1,1,512,19683,1953125,134217728,10604499373,
 794280046581,60716992766464,4605366583984375,
 350356403707485209,26623333280885243904,
 2023966356928852115753,153841020405122283630137]