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A018071 as a simple table

na(n)
01
123
2373
35279
469853
5890519
611105221
7136616783
81666241005
920209628615
10244233494869
112944545727487
1235444499573757
13426213603230711
145121600110316517
1561515496310530991
16738636315663280909

[1,23,373,5279,69853,890519,11105221,136616783,
 1666241005,20209628615,244233494869,2944545727487,
 35444499573757,426213603230711,5121600110316517,
 61515496310530991,738636315663280909]