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A172968 as a simple table

na(n)
01
12
213
389
4610
54181
628657
7196418
81346269
99227465
1063245986
11433494437
122971215073
1320365011074
14139583862445
15956722026041
166557470319842
1744945570212853
18308061521170129
192111485077978050
2014472334024676221

[1,2,13,89,610,4181,28657,196418,1346269,9227465,
 63245986,433494437,2971215073,20365011074,
 139583862445,956722026041,6557470319842,
 44945570212853,308061521170129,2111485077978050,
 14472334024676221]