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A258628 as a simple table

na(n)
15
228
3125
4511
52094
69099
740789
8182685
9818100
103633049
1115953405
1270733998
13322727518
141503364221
156999445956
1632165622185
17145740232841
18653796230890
192924195396658
2013163600932253
2160217177382329
22281484384355033

[5,28,125,511,2094,9099,40789,182685,818100,
 3633049,15953405,70733998,322727518,1503364221,
 6999445956,32165622185,145740232841,653796230890,
 2924195396658,13163600932253,60217177382329,
 281484384355033]