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A221186 as a simple table

na(n)
12
227
3274
42648
523765
6203122
71686374
813787513
9111630017
10898826748
117215684025
1257832318493
13463108937837
143706758773474
1529661932054299
16237327986894765
171898757328855273
1815190598160183104
19121526907452205194

[2,27,274,2648,23765,203122,1686374,13787513,
 111630017,898826748,7215684025,57832318493,
 463108937837,3706758773474,29661932054299,
 237327986894765,1898757328855273,
 15190598160183104,121526907452205194]