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A007856 as a simple table

na(n)
11
23
312
452
5236
61109
75366
826639
9135300
10701269
113700400
1219834973
13107784622
14592705377
153292970302
1618458954896
17104276682820
18593056996445
193392898090908
2019512100041995
21112729617387020
22653965783541960
233807766434556940

[1,3,12,52,236,1109,5366,26639,135300,701269,
 3700400,19834973,107784622,592705377,3292970302,
 18458954896,104276682820,593056996445,
 3392898090908,19512100041995,112729617387020,
 653965783541960,3807766434556940]