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A223993 as a simple table

na(n)
13
231
3476
47927
5132119
62160036
734534687
8540957770
98329684774
10126518474741
111901584578700
1228359907789963
13420651674953990
146217185029060841
1591703594406693983

[3,31,476,7927,132119,2160036,34534687,540957770,
 8329684774,126518474741,1901584578700,
 28359907789963,420651674953990,6217185029060841,
 91703594406693983]