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A175487 as a simple table

na(n)
12
27
337
4127
5397
63613
718089
8162881
91791787
1041211197
11370900973
124821712733
1343395414737
14477349562419
154296146062051
16227695741289567
179335525392876531
18326743388750679161
1916663912826284638251
20583236948919962339073
219915028131639359764313

[2,7,37,127,397,3613,18089,162881,1791787,
 41211197,370900973,4821712733,43395414737,
 477349562419,4296146062051,227695741289567,
 9335525392876531,326743388750679161,
 16663912826284638251,583236948919962339073,
 9915028131639359764313]