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A018998 as a simple table

na(n)
23
37
440
5180
6758
74417
829836
9200559
101331295
118723979
1257418006
13382550298
142579719716
1517578920955
16120847481224

[3,7,40,180,758,4417,29836,200559,1331295,8723979,
 57418006,382550298,2579719716,17578920955,
 120847481224]