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A074599 as a simple table

na(n)
12
28
346
4352
51126
613016
7176138
8182144
93186538
1062075752
1163461422
121488711776
137577414602
1423104065256
15680057071574
1621372905414144
1721646396991594
1821904260478904
19819482859775298
20828045249930848

[2,8,46,352,1126,13016,176138,182144,3186538,
 62075752,63461422,1488711776,7577414602,
 23104065256,680057071574,21372905414144,
 21646396991594,21904260478904,819482859775298,
 828045249930848]