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A006945 as a simple table

na(n)
19
22047
31373653
425326001
53215031751
62152302898747
73474749660383
8341550071728321
9341550071728321
103825123056546413051
113825123056546413051
123825123056546413051
13318665857834031151167461
143317044064679887385961981

[9,2047,1373653,25326001,3215031751,2152302898747,
 3474749660383,341550071728321,341550071728321,
 3825123056546413051,3825123056546413051,
 3825123056546413051,318665857834031151167461,
 3317044064679887385961981]