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A228681 as a simple table

na(n)
121
2217
32529
428977
5333517
63837761
744171841
8508425617
95852202757
1067361890809
11775372578689
128924976046401
13102731553583965
141182498825731233
1513611237290882689
16156673123529460833
171803397245448244085

[21,217,2529,28977,333517,3837761,44171841,
 508425617,5852202757,67361890809,775372578689,
 8924976046401,102731553583965,1182498825731233,
 13611237290882689,156673123529460833,
 1803397245448244085]