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A235877 as a simple table

na(n)
121
251
3129
4339
5921
62571
77329
821219
962121
10183291
11543729
121618899
134832121
1414447211
1543243329
16129533379
17388206921
181163834331
193489930129
2010466644659
2131393642521
2294168344651
23282479868129
24847389272739
252542067154921

[21,51,129,339,921,2571,7329,21219,62121,183291,
 543729,1618899,4832121,14447211,43243329,
 129533379,388206921,1163834331,3489930129,
 10466644659,31393642521,94168344651,282479868129,
 847389272739,2542067154921]