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A018994 as a simple table

na(n)
23
36
424
5189
61050
75130
829586
9183822
101132146
117238454
1248779613
13335824479
142318832312
1515998100231
16110190414096

[3,6,24,189,1050,5130,29586,183822,1132146,
 7238454,48779613,335824479,2318832312,15998100231,
 110190414096]