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A279705 as a simple table

na(n)
12
24
322
4125
5717
64121
723690
8136181
9782826
104500021
1125868076
12148700951
13854797731
144913749086
1528246366671
16162372399730
17933387168180
185365515365948
1930843315747327
20177300792451846
211019202061854748

[2,4,22,125,717,4121,23690,136181,782826,4500021,
 25868076,148700951,854797731,4913749086,
 28246366671,162372399730,933387168180,
 5365515365948,30843315747327,177300792451846,
 1019202061854748]