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A018995 as a simple table

na(n)
23
39
442
5236
61280
76087
832623
9190235
101136383
117203562
1248328561
13330930887
142266788757
1515475719147
16105439268002

[3,9,42,236,1280,6087,32623,190235,1136383,
 7203562,48328561,330930887,2266788757,15475719147,
 105439268002]