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A299591 as a simple table

na(n)
15
25
311
423
553
6121
7250
8533
91162
102490
115327
1211465
1324641
1452882
15113593
16244046
17524134
181125735
192418077
205193785
2111155562
2223961133
2351466258
24110544050
25237437407
26509992017
271095411137
282352832034
295053646321
3010854722326

[5,5,11,23,53,121,250,533,1162,2490,5327,11465,
 24641,52882,113593,244046,524134,1125735,2418077,
 5193785,11155562,23961133,51466258,110544050,
 237437407,509992017,1095411137,2352832034,
 5053646321,10854722326]