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A278749 as a simple table

na(n)
01
11
21
33
49
539
6189
71137
87521
958221
10487521
114615623
1246747449
13523484019
146218441469
1580413567317
161095843999681
1716072230046041
18247107215918241
194053246141598443
2069395454770712489
211258826280827924799
2223749475226740969949
23472083799922946212697
249730211267060692468641
25210327336751547848824261
264701988645468367963255361
27109812853605044722106919663

[1,1,1,3,9,39,189,1137,7521,58221,487521,4615623,
 46747449,523484019,6218441469,80413567317,
 1095843999681,16072230046041,247107215918241,
 4053246141598443,69395454770712489,
 1258826280827924799,23749475226740969949,
 472083799922946212697,9730211267060692468641,
 210327336751547848824261,
 4701988645468367963255361,
 109812853605044722106919663]