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A198795 as a simple table

na(n)
06
141
2251
31511
49071
554431
6326591
71959551
811757311
970543871
10423263231
112539579391
1215237476351
1391424858111
14548549148671
153291294892031
1619747769352191
17118486616113151
18710919696678911
194265518180073471
2025593109080440831

[6,41,251,1511,9071,54431,326591,1959551,11757311,
 70543871,423263231,2539579391,15237476351,
 91424858111,548549148671,3291294892031,
 19747769352191,118486616113151,710919696678911,
 4265518180073471,25593109080440831]