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A227946 as a simple table

na(n)
01
12
27
319
447
5163
6487
71307
82879
919683
1039367
11177147
12531441
131594323
144782969
1514348907
1643046721
1786093443
18258280327
19688747547
203486784401
2110460353203

[1,2,7,19,47,163,487,1307,2879,19683,39367,177147,
 531441,1594323,4782969,14348907,43046721,86093443,
 258280327,688747547,3486784401,10460353203]