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A064521 as a simple table

na(n)
101
110
126
1313
1455
15189
16694
172516
189213
1933782
20124300
21458502
221695469
236284175
2423344173
2586904615
26324197100
271211841846
284538611107
2917029834923
3064014608376
31241046175666
32909171583214
333434698413540
3412995770332449

[1,0,6,13,55,189,694,2516,9213,33782,124300,
 458502,1695469,6284175,23344173,86904615,
 324197100,1211841846,4538611107,17029834923,
 64014608376,241046175666,909171583214,
 3434698413540,12995770332449]