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A049117 as a simple table

na(n)
03
17
219
347
4163
5487
61307
72879
819683
939367
10177147
11531441
121594323
134782969
1414348907
1543046721
1686093443
17258280327
18688747547
193486784401
2010460353203

[3,7,19,47,163,487,1307,2879,19683,39367,177147,
 531441,1594323,4782969,14348907,43046721,86093443,
 258280327,688747547,3486784401,10460353203]