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A121515 as a simple table

na(n)
13
233
3315
426163
5235953
62125035
719129689
8172180323
91549662273
1013947078555
11125524061289
121129717614483
1310167461718993
1491507165036875
15823564514029689
167412080712360643
1766708726669526113
18600378540800575995
195403406869529706889
2048630661832740930803

[3,33,315,26163,235953,2125035,19129689,172180323,
 1549662273,13947078555,125524061289,1129717614483,
 10167461718993,91507165036875,823564514029689,
 7412080712360643,66708726669526113,
 600378540800575995,5403406869529706889,
 48630661832740930803]