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A228477 as a simple table

na(n)
12
24
314
441
5127
6386
71181
83605
911013
1033635
11102734
12313780
13958385
142927208
158940618
1627307464
1783405606
18254747013
19778077691
202376494562
217258563605
2222169941573
2367713990833
24206819875427
25631693101322
261929389878184

[2,4,14,41,127,386,1181,3605,11013,33635,102734,
 313780,958385,2927208,8940618,27307464,83405606,
 254747013,778077691,2376494562,7258563605,
 22169941573,67713990833,206819875427,631693101322,
 1929389878184]