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A006687 as a simple table

na(n)
1241
25521
36481
451361
5346561
6380881
7390001
81678321
94332721
104654801
115576881
1212707521
1339336721
1441432641
1542942001
1699990001
17167948881
18184970641
19197063761
20205598881

[241,5521,6481,51361,346561,380881,390001,1678321,
 4332721,4654801,5576881,12707521,39336721,
 41432641,42942001,99990001,167948881,184970641,
 197063761,205598881]