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A087375 as a simple table

na(n)
12
24
38
481
5243
6729
716384
865536
91953125
109765625
1148828125
122176782336
1313060694016
14678223072849
154747561509943
1633232930569601
172251799813685248
1818014398509481984
19144115188075855872
2012157665459056928801
21109418989131512359209
2210000000000000000000000
23100000000000000000000000
241000000000000000000000000
25108347059433883722041830251

[2,4,8,81,243,729,16384,65536,1953125,9765625,
 48828125,2176782336,13060694016,678223072849,
 4747561509943,33232930569601,2251799813685248,
 18014398509481984,144115188075855872,
 12157665459056928801,109418989131512359209,
 10000000000000000000000,100000000000000000000000,
 1000000000000000000000000,
 108347059433883722041830251]