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A195611 as a simple table

na(n)
13
2481
32079
412797
51968639
68522241
752441603
88067484641
934924139039
10214905676797
1133060550087679
12143119113262081
13880683411072003
14135482126191826401
15586502091223866399
163609040403667391997
17555205720073554501119

[3,481,2079,12797,1968639,8522241,52441603,
 8067484641,34924139039,214905676797,
 33060550087679,143119113262081,880683411072003,
 135482126191826401,586502091223866399,
 3609040403667391997,555205720073554501119]