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A281950 as a simple table

na(n)
14
230
3133
4587
52559
611251
749293
8216274
9948407
104159753
1118243646
1280014078
13350927303
141539109339
156750270615
1629605549628
17129844926004
18569477896562
192497633716174
2010954199079473
2148043264384017
22210709631957358

[4,30,133,587,2559,11251,49293,216274,948407,
 4159753,18243646,80014078,350927303,1539109339,
 6750270615,29605549628,129844926004,569477896562,
 2497633716174,10954199079473,48043264384017,
 210709631957358]