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A004791 as a simple table

na(n)
12
26
37
420
5148
6403
71096
82980
98101
108102
118103
1259874
13442413
141202604
153269017
168886110
1724154952
1865659968
1965659969
20485165195
211318815734
223584912845
233584912846
249744803446
2572004899336
2672004899337
27195729609428
28532048240600

[2,6,7,20,148,403,1096,2980,8101,8102,8103,59874,
 442413,1202604,3269017,8886110,24154952,65659968,
 65659969,485165195,1318815734,3584912845,
 3584912846,9744803446,72004899336,72004899337,
 195729609428,532048240600]