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A197778 as a simple table

na(n)
13
243
3338
43021
525962
6221082
71924263
816672219
9144064579
101245052112
1110769305267
1293170128818
13805820664778
146968541278217
1560268080303023
16521264825241735
174508358297890862
1838991305275498893
19337224718195909596

[3,43,338,3021,25962,221082,1924263,16672219,
 144064579,1245052112,10769305267,93170128818,
 805820664778,6968541278217,60268080303023,
 521264825241735,4508358297890862,
 38991305275498893,337224718195909596]