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A276978 as a simple table

na(n)
11
21
38
416
5243
6729
716384
865536
91953125
109765625
11362797056
122176782336
1396889010407
14678223072849
1535184372088832
16281474976710656
1716677181699666569
18150094635296999121
1910000000000000000000
20100000000000000000000
217400249944258160101211

[1,1,8,16,243,729,16384,65536,1953125,9765625,
 362797056,2176782336,96889010407,678223072849,
 35184372088832,281474976710656,16677181699666569,
 150094635296999121,10000000000000000000,
 100000000000000000000,7400249944258160101211]