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A183664 as a simple table

na(n)
1231
21225
36951
441209
5251991
61577065
710049991
864979929
9425156151
102809324105
1118717758631
12125589227449
13847704901911
145751142882345
1539189002324871
16268044330063769
171839301120097271
1812656313719435785

[231,1225,6951,41209,251991,1577065,10049991,
 64979929,425156151,2809324105,18717758631,
 125589227449,847704901911,5751142882345,
 39189002324871,268044330063769,1839301120097271,
 12656313719435785]