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A018930 as a simple table

na(n)
13
24
312
484
5132
612324
71836
8105552
9255084
10197580
1110358340
1213775220
131936434780
1451299286012
15123205977516
16862441842612
171310543298204
18667510076211780
19207181940072172
20110912831751840
211698410314006284

[3,4,12,84,132,12324,1836,105552,255084,197580,
 10358340,13775220,1936434780,51299286012,
 123205977516,862441842612,1310543298204,
 667510076211780,207181940072172,110912831751840,
 1698410314006284]